extend an object
Really Fast Deep Clone
deep copies objects and arrays
cloning date object as own method. `const copy = original.clone()`
merge and deep-copy objects, get/set properties by dotted name, taint detect
20 lines code! Deep copy the given object considering circular structure
deep copy of an object - primitive types, Array, Date, RegExp ...
deep copy object and rename keys.
Copied from Firebase utils deep-extend
mapper lib, maps source to destination
faster deep-copy for json style data
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