Creates a NamedTuple containing the arguments of the surround method.

This can be used as an alternative to a double splat arg to enforce a strict type, but provide a simple accessor for methods acting as a thin proxy.

Defines a enum where each member holds a reference to an associated value.

This may be used to define enum over non-integer types, whilst keeping the same type safety that integer-backed enums provide.

mapped_enum Example do
  A = "foo"
  B = "bar"
  C = "baz"
end

Members may statically accessed from mapped values

Example["foo"] # => Example::A

Or resolved dynamically

value = "foo"
Example.from_mapped_value value # => Example::A

Mapped values may also be extracted

Example::A.mapped_value # => "foo"

All other functionality, performance and safety that enums provide holds.