histedit: only use pickle if not using the modern save format This avoids a case where PyPy's cPickle module throws a more confusing error than CPython's.

perf: close transaction in perffncachewrite This fixes a bug, and brings CPython behaviour on this test into line with PyPy.

hbisect: use tryreadlines to load state This closes the file handle after reading, which stops PyPy from leaking open file handles and thus failing test-bisect3.t.

eol: make output stable This eliminates a divergence in behaviour between PyPy and Python.