The motivation is a feature for the module described in RFC: Text::CSV::R
. It is an option to set the decimal point. In Germany for example, it is common for CSV files to use a comma as decimal point and a semicolon as field separator.
So I guess a locale approach would be the performance-wise fastest solution. But setting the locale to an arbitrary locale which uses a comma (de_DE, fr_Fr,...) just to change this single parameter seems like hack.
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