http: len(x) fails if it doesn't fit into an int, use __len__() instead
len(x) raises OverflowError if it's bigger than 2**31-1, we need to call
__len__() ourself instead.
adding a
b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
a renamed from b:37d9b5d994eab34eda9c16b195ace52c7b129980
% test with --rev
b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3