FA-76643 / Email MIME structure / Member archive

Collect the plain-text body to display: alternative empty skip · case 03

An HTML-only last alternative produces an empty display although a text alternative exists.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Returns the text/plain strings to display in order. Types compare case-insensitively. multipart/alternative yields the result of its last child that yields any text; other multiparts concatenate their children. Entities with an attachment disposition yield nothing. A message/rfc822 without attachment disposition yields its body; text/plain yields its text; everything else yields nothing.

Why this case matters

Text extraction powers previews, replies and search; wrong choices quote attachments or skip the real body.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
html last alternative	`[]`	`["plain 3"]`	Failed

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