Review of schema metadata vs schema types
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core
java
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Description
The Schema basic types have a place for metadata that can say "this int is really millis since epoch". This deserves some careful design review and perhaps some of these need to be promoted to basic types.
Imported from Jira [BEAM-4081](https://issues.apache.org/jira/browse/BEAM-4081). Original Jira may contain additional context.
Reported by: kenn.
Subtask of issue #18898
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