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7a5762fe6a
In multi-remote environments, `git fetch --all` outputs messages like "Fetching origin" to stdout. Since `check_existing_branches()` only redirected stderr (`2>/dev/null`), the stdout output was captured by the `$(...)` command substitution calling this function, contaminating the branch number return value and causing arithmetic errors like `$((10#Fetching...))`. Fix: redirect both stdout and stderr to /dev/null (`>/dev/null 2>&1`).