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Get-BranchName used `[long]$Number = 0` as both the default and the 'auto-detect' sentinel (`if ($Number -eq 0)`), so an explicitly-passed `-Number 0` was indistinguishable from 'not supplied' and silently auto-incremented. The bash twin keys off whether the value is non-empty (`[ -z "$BRANCH_NUMBER" ]`), so `--number 0` is honored and yields FEATURE_NUM 000 -- a cross-platform divergence for identical input.
Use $PSBoundParameters.ContainsKey('Number') instead, so an explicit value (including 0) is honored and only a missing -Number auto-detects -- mirroring bash. This also aligns the -Timestamp+-Number warning, which bash emits for `--number 0 --timestamp` (non-empty check) but PowerShell previously skipped.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>