Support invariant culture in the GetBoundingBox function

The GetBoundingBox function seems to return values formatted for the report's culture. For instance, in Dutch it will return comma's: [102301,364149998 442306,9578 102314,604849999 442315,3662]

If, for instance, I want to use these coordinates in a URL that requires a decimal point, I need to do a cumbersome replace, e.g.

Replace(Replace(Join(GetBoundingBox([@Feature], 1.1), ';'), ',', '.'), ';', ',')

It would help if GetBoundingBox accepted a third parameter that specifies a format.