language localization causes problems with Moose LaxNum types

[bruceravel]

A localization like LANG=fr_FR calls for commas in place of dots in floats. For example,

sprintf("%.5f", $pi);

will print 3,15159 under that localization. That can trigger this error from Moose:

Attribute (parameter_name) does not pass the type constraint because:
Validation failed for 'LaxNum' with value 3,14159

A solution is to set LANG=en_US in the shell or subshell. It would be nice if Demeter could recognize this localization issue and alter its own environment accordingly.

Alternately, somehow redefine LaxNum (which uses looks_like_number) to accept either commas or dots.

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