Examples
BASE$..len..()
#> NULL
# Inherit from BASE
TEST <- new_class(BASE, class_name = "TEST")
# Override the `..len..` method
register_method(TEST, ..len.. = function() 1)
TEST$..len..()
#> [1] 1
BASE$..len..()
#> NULL
# Inherit from BASE
TEST <- new_class(BASE, class_name = "TEST")
# Override the `..len..` method
register_method(TEST, ..len.. = function() 1)
TEST$..len..()
#> [1] 1