Backport PR #85 on branch versions/v0.3.x (🐛 fix: build the frozendict backport the way the built-in does; document subclassing) - #86

Backport PR #85 on branch versions/v0.3.x (🐛 fix: build the frozendict backport the way the built-in does; document subclassing)#86

nstarman merged 1 commit into

GalacticDynamics:versions/v0.3.xGalacticDynamics/xmmutablemap:versions/v0.3.xfrom

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