Support marshmallow 3 and 4#606

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tomascorrea:support-marshmallow-3-and-4

Commits on Mar 28, 2026

Upgrade to marshmallow 4+

tomascorrea
and
claude
committed
Support both marshmallow 3 (>=3.13) and 4

tomascorrea
and
claude
committed

Commits on Jun 7, 2026

Commits on Jun 21, 2026

Add pragma: no cover to version-conditional branches
tomascorrea
committed