const-oid: make ObjectIdentifier's size const generic
#1300
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Previously the v0.10-pre release series has attempted to make `ObjectIdentifier` generic around a backing buffer containing the BER encoding and bounded on `AsRef<[u8]>`. This approach has a drawback though: we can't use derived `PartialEq`/`Eq`, which means it isn't possible to use in `match` expressions anymore, an ergonomics drawback noted in #1293, with the implementation reverted in #1299. An alternative way to go for what it was trying to implement: an `ObjectIdentifierRef` backed by a `&[u8]` is to use a separate struct. With that approach, there could be overlapping `PartialEq`/`Eq` impls that would allow the two to be compared. As a start towards going that route, this gets rid of the generic backing buffer and opts instead to make the struct const generic around its size with a default.
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Previously the v0.10-pre release series has attempted to make
ObjectIdentifiergeneric around a backing buffer containing the BER encoding and bounded onAsRef<[u8]>.This approach has a drawback though: we can't use derived
PartialEq/Eq, which means it isn't possible to use inmatchexpressions anymore, an ergonomics drawback noted in #1293, with the implementation reverted in #1299.An alternative way to go for what it was trying to implement: an
ObjectIdentifierRefbacked by a&[u8]is to use a separate struct. With that approach, there could be overlappingPartialEq/Eqimpls that would allow the two to be compared.As a start towards going that route, this gets rid of the generic backing buffer and opts instead to make the struct const generic around its size with a default.