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Code reviewHardcr-g115
Subject UnicodeLevel Senior–Staff~30 minCommon in Code quality & review interviewsIndustries Software development

Question

Review this Python username uniqueness check.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix — specific and kind.

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Code to reviewpython
def is_available(requested: str, taken: set[str]) -> bool:    return requested.lower() not in taken def register(requested, taken):    if is_available(requested, taken):        taken.add(requested.lower())        return True    return False
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