Returns a proxy object (i.e. an atomic vector or data frame of atomic
vectors). For vctrs, this determines the behaviour of == and
!= (via vec_equal()); unique(), duplicated() (via
vec_unique() and vec_duplicate_detect()); is.na() and anyNA()
(via vec_equal_na()).
vec_proxy_equal(x)A vector x.
A 1d atomic vector or a data frame.
The default method calls vec_proxy_compare, which makes all vector classes
equal-able by default. If your object is not, provide a
vec_proxy_equal() method that throws an error.