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Worktree names now support /-separated path segments (e.g., feature/my-branch). Each segment is independently validated for allowed characters (letters, digits, dots, underscores, dashes). The 64-character maximum length still applies to the full name.
Evidence
Path segment validation (search for "each \"/\"-separated segment must be non-empty")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.