פירוש על עבודה זרה 13:4

The dispute between R. Judah and R. Meir was found in Bava Kamma. In Bava Metzia a mishnah teaches that whoever changes the agreement, such as a dyer who dyes the wrong color, has the lesser right. He can claim either the costs or the increased value, whichever is less. This is the same as R. Judah’s opinion.