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Pull #2826

github

Set api.version when the version is the only path segment

The path versioner only extracted the version when a second slash
followed it (path_info.index('/', 1)), so the root route of a
path-versioned API (GET /v1, or /v1.json with a format suffix) matched
and ran without env['api.version'] — the `version` helper returned nil
and entity `version:` embeds were omitted.

When the path is a single segment, record the version on an exact match
against the declared versions, trimming a trailing .format suffix
(right-to-left, so dotted versions like v1.2 still match). An unmatched
segment is left for the router to resolve — never a 404 from here.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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