mercurial/helptext/config.txt

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    - 'strict': push is abort if another client touched the repository
      while the push was preparing. (default)
    - 'check-related': push is only aborted if it affects head that got also
      affected while the push was preparing.

    This requires compatible client (version 4.3 and later). Old client will
    use 'strict'.

``validate``
    Whether to validate the completeness of pushed changesets by
    checking that all new file revisions specified in manifests are
    present. (default: False)

44437:c85d5fd1a5d9

    - 'strict': push is abort if another client touched the repository
      while the push was preparing. (default)
    - 'check-related': push is only aborted if it affects head that got also
      affected while the push was preparing.

    'check-related' only takes effect for compatible clients (version
    4.3 and later). Older clients will use 'strict'.

``validate``
    Whether to validate the completeness of pushed changesets by
    checking that all new file revisions specified in manifests are
    present. (default: False)