Add clear() to MapCache

[jamiebuilds]

Currently building a rich translator using _.memoize, it'd be nice to memoizedFn.cache.clear() when the language changes.

Since the API is following the native Map I figure it should include the clear method:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear

[jamiebuilds]

@megawac You mean memoized.cache.__data__ = {}, and I can, it's just not a nice API.

[jdalton]

Hey @thejameskyle! Related to #882, #1269.

[jamiebuilds]

💩

[jdalton]

The route would be to make _.memoize.Cache = Map.
The reason we punt on clear is because devs can do _.memoize.Cache = WeakMap.

[lock]

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