make normalize_key cpdef & add warnings for unpickle unmarshal fail#66

Merged

MOON-CLJ merged 3 commits intodouban:masterfrom

MOON-CLJ:cython_minor_fix

Feb 27, 2018

Commits on Feb 26, 2018

Commits on Feb 27, 2018

let user have a chance to know cython encode or decode err
MOON-CLJ
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