A declaration of where one handler argument comes from.
T is the value the source resolves to; it is carried in a phantom optional
property so Params can check each source against the handler
parameter it binds. The property is never read and never written at runtime.
A declaration of where one handler argument comes from.
Tis the value the source resolves to; it is carried in a phantom optional property soParamscan check each source against the handler parameter it binds. The property is never read and never written at runtime.Since
0.2.0