The setters are called when the property is first initialized, and before
that its default min and max are 0.0 and 1.0 respectively.
If you configured min_value to 1.0 and max_value to e.g. 3.0, since the
min_value setter can be called before that of max_value (which thus still
defaults to 1.0), the min will be set to 0.99.
Same conflict could happen with a configured max_value of 0 if its setter
is called before that of a valid, negative min value.
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