Let pick expect an Iterable instead of multiple optional args

[Wikiwix]

The pick function takes multiple optional args, which has multiple downside to expecting an Iterable of args:

• Allows for arbitrarily deep nesting
• Allows for something like pick(json, 'some.key.inside.the.next'.split('.')) which might be easier to write especially for deeply nested JSONs wich always have String keys.
• Allows to use the function more dynamically (e.g. without knowing the depth beforehand)