Currently, methods that expose random behaviour, like sample, use the internal Math.random() function, which is unseeded. Not being able to optionally enforce deterministic behaviour in a functional setting is... odd. I would like to suggest the discussion over possible enhancements and alternatives to implement such feature, amongst which:

• Change all internal function call of Math.random() to a lodash random number generator;
• Make this random number generator a... generator function;
• Support passing an extra parameter in functions like sample to set the seed;
• Support an optional callback in functions like sample that provides a generator;
• Get an objective measurement on the performance impact of such changes, and aim for a zero-cost abstraction so we don't end up with angry people.