Spanish ll in different dialects

Okay, so this is my first year of non-basic Spanish class (since I'm now a
Freshman :D).  My Spanish teacher threw off the class when she was having us
memorize "puedo ir a mi casillero," where she pronounced the ll as /dZ/.  Of
course, we're used to the Mexican /L/ whereas she used the Panama /dZ/.  Does
anyone know any other dialects that pronounce ll as j?  Or why this is so?

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