ecdsa_raw_verify() with der_decode_sig() always Error, because of 27 <= None <= 34

[b0r1ngx]

I'm try using blockcypher python library, but problem is in bitcoin lib:

I just try to navigate at library methods, and see that it always error on this place, because method ecdsa_raw_verify(), always get tuple type (None, Int, Int), and we get in v None always, and then compare it between 27 and 34

on 529 code line, we always get error