FXString::find_last_of

In Fox 1.6.57, there are several versions of this function, among them:

FXint find_last_of(const FXchar* set,FXint pos=2147483647) const;
FXint find_last_of(const FXString& set,FXint pos=2147483647) const;
FXint find_last_of(FXchar c,FXint pos=0) const;

Note how the default for pos is different for the single-character 
version, and it doesn't behave the same, since pos=0 causes it to search 
backwards from the beginning of the string and return -1 when not 
explicitly given a pos argument. Surely this must be unintentional?

Enno.