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The bash and Python twins validate --number against ^[0-9]+$ and reject a
negative value with 'Error: --number must be a non-negative integer'. The
PowerShell twin declares the parameter as [long]$Number, so PowerShell binds
'-5' as -5 instead of rejecting it. That value then formats via '{0:000}' to
'-005' and yields a branch name starting with a dash, which git refuses (refs
cannot begin with '-') — a confusing late failure instead of the twins' clear
early error.
Guard for $Number -lt 0 up front (before the description check, matching the
bash twin's parse-time validation order) and emit the identical error. An
explicit -Number 0 is still honored, preserving the #3412 fix.
Add matching negative-number parity tests to the bash and PowerShell
create-feature suites, mirroring the existing test_explicit_number_zero_is_honored
pair. Same PowerShell-parity bug class as #3412.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>