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Validate an entire identifier
Python: Use fullmatch so a regex must consume the complete input.
Python✓ Tested
Wait for a background job before reading its output
Bash Scripts: Save the job PID and wait explicitly before consuming files it produces.
Bash Scripts✓ Tested
Write and read bytes without text conversion
C++: Use binary stream modes and check each I/O operation before consuming its result.
C++✓ Tested