Release 6.0.0-pre.20211202.4 (2021-12-20)

Baseline: 00a3354

Cherry picks:

• c873525:
  Extract out constant for "current time" magic value in
  Path#setLastModifiedTime, to avoid confusion.
• 7074bcf:
  Automated rollback of commit
  ed825a4.
• 4e90ad7:
  Release 6.0.0-pre.20211202.4 (2021-12-20)

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