[ObjC] Add Swift helpers for GPBUnknownFields
/GPBUnknownField
.
#17297
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[ObjC] Add Swift helpers for
GPBUnknownFields
/GPBUnknownField
.GPBUnknownFields
additions:Optional
based apis for thegetFirst*
apis.NSFastEnumeration
over as aSequence
to support looping over the fields.GPBUnknownField
addition:enum
with associated values to provide a more type-safe way for inspection.