Checks to see if he unput is a single character.
1 2 3 4 5 6 7
A character vector.
A logical value. If
How severe should the consequences of the assertion be?
Not intended to be used directly.
TRUE when the input is a
single character (as determined by
nchar; this excludes
assert_* functions return nothing but throw an error if the
is_* function returns
The behaviour of this function has changed so that
NA rather than
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