Fix #931: Support no-change parameters in setresuid/setresgid #2706
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- Change signature to accept Option<Uid/Gid> - None maps to -1 via wrapping arithmetic - Add comprehensive tests for both Some and None cases - Fix setresgid documentation link (was pointing to setresuid)
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Enable passing -1 (no-change) to setresuid/setresgid by changing signatures from
UidtoOption<Uid>. None maps to -1 via wrapping arithmetic. Based on PR #1009/#1305 approach. Includes comprehensive tests for both Some and None cases. Fixes setresgid doc bug.Fixes: #931