Version 0.6 (2022-09-13)

• Parameterise the ContentType data type over the "parameters" field. The type becomes ContentTypeWith a. The data constructor name remains ContentType. Reintroduce ContentType as a type synonym for ContentTypeWith Parameters. A "bare content type" without parameters can be represented as ContentTypeWith ().

• Introduce emptyParameters :: Parameters. It is the same as mempty but is convenient where mempty is ambiguous.

• Accept Content-Type: multipart/related without type parameter.

  RFC 2387 requires the type parameter. Nevertheless some producers, including GMail and Fastmail, generate non-conformant messages without the type parameter. Wrap the Related constructor's ContentType field in a Maybe. (#68)

• Introduce the ContentID type and use it for the multipart/related start parameter.

• Add missing end-of-input assertions to several "secondary" parsers, which could otherwise accept invalid data.

• defaultCharsets: recognise ascii as an alias of us-ascii. (#69)

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