This is a helper function for the common parts of make_ and
sample_.
.extract_constructor_and_modifiers(..., .operation, .variant)A named list with three items: ‘cons’ for the constructor function, ‘mods’ for the modifiers and ‘args’ for the remaining, unparsed arguments.
Parameters to extract from
Human-readable description of the operation that this helper is a part of
Constructor variant; must be one of ‘make’, ‘graph’ or ‘sample’. Used in cases when the same constructor specification has deterministic and random variants.