What minimum hash length is allowed for a GitHub URL?

Other
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2

partial hash is at least four characters long and unambiguous

git-scm.com/book/en/v2/Git-Tools-Revision-Selection#_short_sha_1

Example

github.com/violentmonkey/violentmonkey.github.io/blob/587d/content/api/metadata-block.md#repos-sticky-header

3

See also: What minimum hash length is enough for a GitHub URL?