object-keys
An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim
is-accessor-descriptor
Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
is-data-descriptor
Returns true if a value has the characteristics of a valid JavaScript data descriptor.
is-descriptor
Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
map-obj
Map object keys and values into a new object