chore: add FieldMask type to apiutils #5247
Merged
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Description
While reviewing #5177, I noticed some ergonomic issues working with FieldMasks and wanted to help make that easier. In particular:
a.b
and should carry the semantics that a descendent field likea.b.c
should be considered in the field set.So I made a new type (with tests) that uses a map for containment checks and respects the listed FieldMask conventions.
Test Plan
No behavior should change as a result of this PR.