Caught via fuzzing:

	"\x8c\x030\n02\x93."

        0: \x8c SHORT_BINUNICODE '0\n0'
        5: 2    DUP
        6: \x93 STACK_GLOBAL
        7: .    STOP

	panic: protocol 0: decode back error: err
	pickle: "c0\n0\n0\n0\n."

	goroutine 1 [running]:
	github.com/kisielk/og-rek.Fuzz(0x7f2f1009a000, 0x8, 0x200000, 0x3)
	        /tmp/go-fuzz-build645492341/gopath/src/github.com/kisielk/og-rek/fuzz.go:47 +0x8b8
	go-fuzz-dep.Main(0x525e10)
	        /tmp/go-fuzz-build645492341/goroot/src/go-fuzz-dep/main.go:49 +0xad
	main.main()
	        /tmp/go-fuzz-build645492341/gopath/src/github.com/kisielk/og-rek/go.fuzz.main/main.go:10 +0x2d
	exit status 2

i.e. '0\n0' module name was emitted as-is as part ot text-based GLOBAL which
completely broke pickle stream.

For the reference Python decodes such globals with \n in name just ok:

	In [10]: s = b"S'decimal\\nq'\nS'Decimal'\n\x93."

	In [11]: pickle.loads(s)
	---------------------------------------------------------------------------
	ModuleNotFoundError                       Traceback (most recent call last)
	<ipython-input-11-764e4625bc41> in <module>()
	----> 1 pickle.loads(s)

	ModuleNotFoundError: No module named 'decimal\nq'

	In [12]: import sys

	In [15]: d = sys.modules['decimal']

	In [16]: sys.modules['decimal\nq'] = d

	In [17]: pickle.loads(s)
	Out[17]: decimal.Decimal