Coerce the input to a different class, with a warning. More reliable then
as, and supports coercion to multiple classes.
Input to coerce.
The desired class of x. Multiple values allowed (see note).
Not intended to be used directly.
x after attempted coercion to the target class.
If x does not already have the target class, a warning is given
The function will try and convert the
x to each of the classes given
target_class, in order, until it succeeds or runs out of classes
to try. It will first try and convert
x using a dedicated
as.target_class function if that exists. If it does not exist, or
throws an error then
coerce_to will try to use
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