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Add bigint type
This patch adds a bigint type to WebIDL with the following properties: - bigint corresponds directly to BigInt - The conversion from JS is based on ToBigInt, namely it throws on Number. - bigint is not grouped as a "numeric" type, as this category is often used to refer to types which have a JavaScript representation of Number. - bigint is included in the overloading resolution algorithm, and it's possible to overload a function for BigInt and numeric arguments. - bigint constants are provided with syntax analogous to JS. - bigint is included in the es-to-union algorithm. Although it may be on the early side for such a change, the lack of BigInt WebIDL integration is already coming up in some designs for integrating BigInt with the Web Platform, such as w3c/IndexedDB#231
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‎index.bs‎

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@@ -192,12 +192,21 @@ urlPrefix: https://tc39.github.io/ecma262/; spec: ECMA-262
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text: own property; url: sec-own-property
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text: Property Descriptor; url: sec-property-descriptor-specification-type
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text: realm; url: realm
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urlPrefix: https://tc39.github.io/proposal-bigint/; spec: BIGINT
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text: ToBigInt; url: #sec-to-bigint; type: abstract-op
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text: BigInt; url: #sec-ecmascript-language-types-bigint-type; type: dfn
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</pre>
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<pre class=biblio>
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{
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"GEOMETRY": {
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"aliasOf": "GEOMETRY-1"
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},
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"BIGINT": {
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"href": "https://tc39.github.io/proposal-bigint/",
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"title": "BigInt Specification",
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"publisher": "TC39",
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"status": "Stage 3 proposal"
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}
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}
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</pre>
@@ -1591,7 +1600,8 @@ constant declaration gives the value of the constant, which can be
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one of the two boolean literal tokens (<emu-t>true</emu-t>
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and <emu-t>false</emu-t>),
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the <emu-t>null</emu-t> token, an
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<emu-t class="regex"><a href="#prod-integer">integer</a></emu-t> token,
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<emu-t class="regex"><a href="#prod-integer">integer</a></emu-t> token, a
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<emu-t class="regex"><a href="#prod-bigint">bigint</a></emu-t> token,
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a <emu-t class="regex"><a href="#prod-float">float</a></emu-t> token,
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or one of the three special floating point constant values
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(<emu-t>-Infinity</emu-t>, <emu-t>Infinity</emu-t> and <emu-t>NaN</emu-t>).
@@ -1733,6 +1743,7 @@ The following extended attributes are applicable to constants:
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BooleanLiteral
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FloatLiteral
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integer
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bigint
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"null"
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</pre>
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@@ -3467,6 +3478,9 @@ the following algorithm returns <i>true</i>.
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</div></th>
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<th><div>
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<span>numeric types</span>
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</div></th>
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<th><div>
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<span>bigint</span>
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</div></th>
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<th><div>
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<span>string types</span>
@@ -3501,6 +3515,7 @@ the following algorithm returns <i>true</i>.
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<td>●</td>
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<td>●</td>
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<td>●</td>
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<td>●</td>
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</tr>
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<tr>
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<th>numeric types</th>
@@ -3513,11 +3528,26 @@ the following algorithm returns <i>true</i>.
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<td>●</td>
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<td>●</td>
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<td>●</td>
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<td>●</td>
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</tr>
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<tr>
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<th>bigint</th>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td></td>
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<td>●</td>
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<td>●</td>
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<td>●</td>
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<td>●</td>
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<td>●</td>
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<td>●</td>
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<td>●</td>
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</tr>
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<tr>
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<th>string types</th>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td></td>
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<td>●</td>
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<td>●</td>
@@ -3531,6 +3561,7 @@ the following algorithm returns <i>true</i>.
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td></td>
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<td>●</td>
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<td></td>
@@ -3544,6 +3575,7 @@ the following algorithm returns <i>true</i>.
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td></td>
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<td>●</td>
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<td>●</td>
@@ -3557,6 +3589,7 @@ the following algorithm returns <i>true</i>.
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td>(a)</td>
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<td>●</td>
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<td>●</td>
@@ -3570,6 +3603,7 @@ the following algorithm returns <i>true</i>.
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td></td>
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<td></td>
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<td>●</td>
@@ -3583,6 +3617,7 @@ the following algorithm returns <i>true</i>.
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td></td>
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<td>●</td>
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</tr>
@@ -3596,6 +3631,7 @@ the following algorithm returns <i>true</i>.
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td class="belowdiagonal"></td>
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<td></td>
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</tr>
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</table>
@@ -5355,7 +5391,7 @@ the [=integer types=],
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{{unrestricted double}}.
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The <dfn id="dfn-primitive-type" export>primitive types</dfn> are
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{{boolean}} and the [=numeric types=].
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{{boolean}}, {{bigint}} and the [=numeric types=].
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The <dfn id="dfn-string-type" export>string types</dfn> are
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{{DOMString}}, all [=enumeration types=],
@@ -5463,6 +5499,7 @@ type.
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"boolean"
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"byte"
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"octet"
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"bigint"
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</pre>
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<pre class="grammar" id="prod-UnrestrictedFloatType">
@@ -5578,6 +5615,18 @@ The [=type name=] of the
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{{octet}} type is "<code>Octet</code>".
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<h4 id="idl-bigint" interface>bigint</h4>
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The {{bigint}} type is an arbitrary integer, unrestricted in range.
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{{bigint}} constant values in IDL are
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represented with <emu-t class="regex"><a href="#prod-bigint">bigint</a></emu-t>
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tokens.
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The [=type name=] of the
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{{bigint}} type is “BigInt”.
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<h4 oldids="dom-short" id="idl-short" interface>short</h4>
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The {{short}} type is a signed integer
@@ -6864,6 +6913,9 @@ ECMAScript value type.
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1. If <a abstract-op>Type</a>(|V|) is Number, then
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return the result of <a href="#es-to-unrestricted-double">converting</a> |V|
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to an {{unrestricted double}}.
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1. If <a abstract-op>Type</a>(|V|) is [=BigInt=], then
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return the result of <a href="#es-to-bigint">converting</a> |V|
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to an {{bigint}}.
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1. If <a abstract-op>Type</a>(|V|) is String, then
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return the result of <a href="#es-DOMString">converting</a> |V|
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to a {{DOMString}}.
@@ -7294,6 +7346,27 @@ value when its bit pattern is interpreted as an unsigned 64 bit integer.
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{{unrestricted double}} value.
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</div>
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<h4 id="es-bigint">bigint</h4>
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<div id="es-to-bigint" algorithm="convert an ECMAScript value to a bigint">
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An ECMAScript value |V| is [=converted to an IDL value|converted=]
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to an IDL {{bigint}} value by running the following algorithm:
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1. Let |x| be [=?=] <a abstract-op>ToBigInt</a>(|V|).
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1. Return the IDL {{bigint}} value that represents the same numeric
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value as |x|.
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</div>
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<div id="bigint-to-es" algorithm="convert a bigint to an ECMAScript value">
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The result of [=converted to an ECMAScript value|converting=]
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an IDL {{bigint}} value to an ECMAScript value is a [=BigInt=]:
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1. Return the [=BigInt=] value that represents the same numeric value
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as the IDL {{bigint}} value.
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</div>
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<h4 id="es-DOMString">DOMString</h4>
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@@ -7988,23 +8061,30 @@ that correspond to the union’s [=member types=].
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1. If |types| includes {{object}}, then return the IDL value
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that is a reference to the object |V|.
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1. If <a abstract-op>Type</a>(|V|) is Boolean, then:
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1. If |types| includes a {{boolean}},
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1. If |types| includes {{boolean}},
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then return the result of [=converted to an IDL value|converting=]
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|V| to {{boolean}}.
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1. If <a abstract-op>Type</a>(|V|) is Number, then:
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1. If |types| includes a [=numeric type=],
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then return the result of [=converted to an IDL value|converting=]
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|V| to that [=numeric type=].
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1. If <a abstract-op>Type</a>(|V|) is [=BigInt=], then:
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1. If |types| includes {{bigint}},
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then return the result of [=converted to an IDL value|converting=]
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|V| to {{bigint}}
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1. If |types| includes a [=string type=],
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then return the result of
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[=converted to an IDL value|converting=]
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|V| to that type.
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1. If |types| includes a [=numeric type=],
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then return the result of [=converted to an IDL value|converting=]
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|V| to that [=numeric type=].
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1. If |types| includes a {{boolean}},
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1. If |types| includes {{boolean}},
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then return the result of [=converted to an IDL value|converting=]
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|V| to {{boolean}}.
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1. If |types| includes a {{bigint}},
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then return the result of [=converted to an IDL value|converting=]
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|V| to {{bigint}}.
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1. [=ECMAScript/Throw=] a {{ECMAScript/TypeError}}.
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</div>
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@@ -10592,6 +10672,16 @@ Note: The HTML Standard defines how a security check is performed. [[!HTML]]
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then remove from |S| all other entries.
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1. Otherwise: if <a abstract-op>Type</a>(|V|) is [=BigInt=]
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and there is an entry in |S| that has one of the following types at position |i| of its type list,
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* {{bigint}}
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* a [=nullable type|nullable=] {{bigint}}
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* an [=annotated type=] whose [=annotated types/inner type=] is one of the above types
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* a [=union type=], [=nullable type|nullable=] union type, or [=annotated type|annotated=] union type
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that has one of the above types in its [=flattened member types=]
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then remove from |S| all other entries.
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1. Otherwise: if there is an entry in |S| that has one of the following types at position |i| of its type list,
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* a [=string type=]
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* a [=nullable type|nullable=] version of any of the above types
@@ -10619,6 +10709,15 @@ Note: The HTML Standard defines how a security check is performed. [[!HTML]]
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then remove from |S| all other entries.
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1. Otherwise: if there is an entry in |S| that has one of the following types at position |i| of its type list,
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* {{bigint}}
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* a [=nullable type|nullable=] {{bigint}}
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* an [=annotated type=] whose [=annotated types/inner type=] is one of the above types
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* a [=union type=], [=nullable type|nullable=] union type, or [=annotated type|annotated=] union type
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that has one of the above types in its [=flattened member types=]
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then remove from |S| all other entries.
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1. Otherwise: if there is an entry in |S| that has {{any}} at position |i|
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of its type list, then remove from |S| all other entries.
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1. Otherwise: [=ECMAScript/throw=] a {{ECMAScript/TypeError}}.
@@ -13568,6 +13667,11 @@ expression syntax [[!PERLRE]]) as follows:
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<td><code>=</code></td>
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<td><code class="regex"><span class="mute">/</span>-?(([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)([Ee][+-]?[0-9]+)?|[0-9]+[Ee][+-]?[0-9]+)<span class="mute">/</span></code></td>
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</tr>
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<tr>
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<td id="prod-bigint"><emu-t class="regex">bigint</emu-t></td>
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<td><code>=</code></td>
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<td><code class="regex"><span class="mute">/</span>-?([1-9][0-9]*|0[Xx][0-9A-Fa-f]+|0[0-7]*)n<span class="mute">/</span></code></td>
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</tr>
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<tr>
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<td id="prod-identifier"><emu-t class="regex">identifier</emu-t></td>
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<td><code>=</code></td>

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