Generates a dict
This expression evaluates to a function of the form:
(seed) -> any
The function is consistent with generator semantics of the Random Data step.
Given a seed value, the function returns a dict. The template dict is used to generate the result.
The template dict to use as for generation.
The returned dict has the same keys as the template dict.
Each non-function value is retained in the result as is.
Each function value is interpreted as a generator function of the form
Chance of nil
Probability in range of