The results so far are inconclusive:
The rope cache tries have been reduced by more than 125K (nearly 20%),
but the bootstrap time seems to be ever slightly increasing (0.01s).
For example, this allows you to pick up a proc with a specific signature from
an overload set.
bugfix: nimrod generated invalid code when a RVO function had a single
compile-time param
bugfix: nkHiddenDerefs were not neutralised properly for indirect proc calls
types are now valid proc/template/macro params and you can overload over them:
proc foo(T: typedesc) # accept any type
proc foo(T: typedesc{int}) # overload specifically for int
proc foo(T: typedesc{int or float or Callable}) # overload for any type matching the constraints
expr{type} is a param expecting compile time value of the designated type (or type class).
when typedesc or expr params are used with a proc, the proc will be instantiated once
for each unique type/value used as parameter.
