what's different from spec

[princemaple]

Missing

• =/ not implemented, didn't have the need for it
• case insensitive by default is not honored, again didn't really have the need for it at the moment
  • Rfc7405 #16 adds the ability to explicitly enable case-insensitivity, but default is still case-sensitive
  • switched to case-insensitive by default. #18 it's now the default
• prose-val matching is generated to match everything til EOL, because what else can we do?

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Addition

• added an exception syntax so I could parse IMAP (RFC3501) without hand coding the few prose clauses