Examples
BASE$..str..()
#> [1] "<BASE class>"
# Inherit from BASE
TEST <- new_class(BASE, class_name = "TEST")
TEST$..str..()
#> [1] "<TEST class>"
# Instantiate
test <- BASE$instantiate()
test$..str..()
#> [1] "<BASE object>"
BASE$..str..()
#> [1] "<BASE class>"
# Inherit from BASE
TEST <- new_class(BASE, class_name = "TEST")
TEST$..str..()
#> [1] "<TEST class>"
# Instantiate
test <- BASE$instantiate()
test$..str..()
#> [1] "<BASE object>"