phony_formatted not returning original String for non-digit only strings

[aptituz]

The documentation for phony_formatted states that: "When an error occurs during conversion it will return the original String." but this is not true.

Given the following example:

'acbdef'.phony_formatted

it returns nil, too, since in all non-digit characters are removed from the string (https://github.com/joost/phony_rails/blob/master/lib/phony_rails/string_extensions.rb#L29).

In practice, when one uses phony_formatted for the value of an input field, this leads to user input wrongly replaced with nothing. The obvious workaround is something like

value.phony_formatted || value

But I wonder if the method itself shouldn't be changed in a way that matches the documented behaviour. Especially since there is an option to be strict about values.

[joost]

This is intended behaviour. The documentation intends that if you pass a string variable this string is not changed.