Comment # 4 on bug 1206623 from Reinhard Max

Wow, this opens a can of worms in generic/tclCmdMZ.c which I need to discuss
with the upstream community, but the bug at hand can be fixed by removing a
block of code that is only there as a speed optimisation for string comparison
and due to another bug never gets called on little endian and only rarely on
big endian.