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I have committed the patch as

libshelve.tex 1.20
shelve.py 1.21
test_shelve.py 1.4
NEWS 1.737

In these changes, the binary parameter got upgraded to
protocol; binary was added after writeback for compatibility
and pendingly deprecated. The test case usage of binary was
mainly preserved, and protocol 2 test cases added.

Alex: NEWS is Misc/NEWS; any non-bug fix change is listed there.