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mapclaims: stop treating exp=0 as a missing claim ( 509)

mapclaims: stop treating exp=0 as a missing claim ( 509): a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: Token with exp: 0 is not treated as expired when parsed without WithJSONNumber()

The task

**Title:** Token with `exp: 0` is not treated as expired when parsed without `WithJSONNumber()`

Part of FineEnvs/repo2rlenv-commit-runtime.