fix: fix expiry for `to_json()`#589

Merged

busunkim96 merged 7 commits intogoogleapis:masterfrom

Sep 17, 2020

Commits on Aug 10, 2020

This patch for </issues/501> includes the following fixes:
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Commits on Aug 16, 2020

added/updated test cases
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Commits on Aug 17, 2020

linter patch
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Commits on Sep 8, 2020

Commits on Sep 16, 2020

Merge branch 'master' into master
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