Small Mem Sofit
According to the interpretation of R. Yosef Tov Elem (980-1050), composer of the piyyut Chasal Siddur Pesach, the mem sofit in וטהרתם in Bamidbar 31:24 is written small. However this is clearly a very minority opinion as I have not seen it listed elsewhere else. I found it recently listed in a web list but without a source and haven't seen it in any other listing. Has anyone seen this before or even in a Sefer Torah?