Double dispatch methods to support vctrs::vec_ptype2().

# S3 method for hms
vec_ptype2(x, y, ..., x_arg = "", y_arg = "")

## Arguments

x Vector types. Vector types. These dots are for future extensions and must be empty. Argument names for x and y. These are used in error messages to inform the user about the locations of incompatible types (see stop_incompatible_type()). Argument names for x and y. These are used in error messages to inform the user about the locations of incompatible types (see stop_incompatible_type()).