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@@ -250,4 +250,8 @@ def base62_encode(num: int, minwidth: int = 1) -> str:
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def non_null_str_or_none(val: Any) -> Optional[str]:
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+ """Check that the arg is a string containing no null (U+0000) codepoints.
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+
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+ If so, returns the given string unmodified; otherwise, returns None.
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+ """
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return val if isinstance(val, str) and "\u0000" not in val else None
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