We have compound indexes like this:

When we are in German locale and pass this as a string to this method:

Query & hint (const string &jsonKeyPatt)

it throws an exception (FailedToParse: Expecting '}' or ',') because the parse method in json.cpp uses strtod() to parse the numbers. In any locale that uses commas as decimal places the parsing does not work because strtod() strips the comma as part of the number.

As a workaround we will use the hint() method that takes a BSON object.

I'm not sure if there are other places where this will cause issues.