Simpler multiple invocation of generators

[phil-brad]

Currently the easiest way to invoke many values of a generator is like so:
"alpha": "#repeat(@MyGenerator, 10)"
It's doesn't come across particularly concise. Perhaps a syntax rule could be introduced to allow something like:
"alpha": "@MyGenerator(10)"

[mtinning]

Do we have any situations when we need to have constructor-like arguments to MyGenerator?

[phil-brad]

Constructor like arguments are fed in the generators section of the spec. In the spec-part they are not needed. The arguments in the spec part would be more analagous to arguments to a __call__ method in Python.