lin_exp needs to be rewritten to lin_eq, and check the type (int or float)
lin_exp needs to be rewritten to lin_eq, and check the type (int or float)

tias/libminizinc,nathanielbaxter/libminizinc,jjdekker/libminizinc,jjdekker/libminizinc,jjdekker/libminizinc,nathanielbaxter/libminizinc,jjdekker/libminizinc,tias/libminizinc,nathanielbaxter/libminizinc,nathanielbaxter/libminizinc