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[utils] Disallow non string types in parse_duration (Closes #4679)
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@ -1269,7 +1269,7 @@ def float_or_none(v, scale=1, invscale=1, default=None):
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def parse_duration(s):
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if s is None:
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if not isinstance(s, basestring if sys.version_info < (3, 0) else compat_str):
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return None
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s = s.strip()
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