Bio.Cluster not checking arguments under Python 3 #340
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I found this while investigating what is probably a big-endian issue in the C code which checks the single-letter arguments (not fixed, see mailing list discussion):
Relevant C code:
Jakob worte: But PyUnicode_AS_DATA() returns a pointer to UTF-32 data. On big-endian architectures (such as powerpc or s390x), the first byte is always 0, so strlen() returns 0.