vec_is() is a predicate that checks if its input conforms to a
prototype and/or a size.
vec_assert() throws an error when the input doesn't conform.
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A vector argument to check.
Prototype to compare against. If the prototype has a
Size to compare against
Name of argument being checked. This is used in error
messages. The label of the expression passed as
throws a typed error (see section on error types) or returns
If the prototype doesn't match, an error of class
"vctrs_error_assert_ptype" is raised.
If the size doesn't match, an error of class
"vctrs_error_assert_size" is raised.
Both errors inherit from
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