feedkeys_spec.lua:
In the "backspace test spec, the backspace
setting is given an integer, but only accepts
strings. Here, I assume that 0 was intended to
set backspace to a nil value, which can be done
with the empty string. I also corrected the name
of the test spec.
core_spec.lua:
In the "textedit" test spec, the actual and
expected outputs as well as the actual and
expected end characters did not match.
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