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_detect_missing()).
vec_proxy_equal(x, ...)A 1d atomic vector or a data frame.
A vector x.
These dots are for future extensions and must be empty.
If the proxy for x is a data frame, the proxy function is automatically
recursively applied on all columns as well. After applying the proxy
recursively, if there are any data frame columns present in the proxy, then
they are unpacked. Finally, if the resulting data frame only has a single
column, then it is unwrapped and a vector is returned as the proxy.
vec_proxy() called by default
The default method calls vec_proxy(), as the default underlying
vector data should be equal-able in most cases. If your class is
not equal-able, provide a vec_proxy_equal() method that throws an
error.