Fix ClassCastException in DoubleLocaleConverter when input is non-Double Number

[rootvector2]

DoubleLocaleConverter.parse() only handled the Long case for non-String inputs; any other Number subtype (e.g. Integer, Float, BigDecimal) passed directly to the converter was unchecked-cast to Double, throwing ClassCastException instead of a proper conversion.

[garydgregory]

Merged 🚀 Thank you @rootvector2 , please port to 1.x.

[rootvector2]

thanks for merging, will get the 1.x port up.

[rootvector2]

thanks for the merge. 1.x port is up in #424. same root cause there, though it surfaces as a ConversionException instead since the cast happens in BaseLocaleConverter rather than in parse.