function propertyDescriptorsIn( value ) {
	var desc;
	var keys;
	var obj;
	var tmp;
	var i;

	if ( value === null || value === void 0 ) {
		return {};
	}
	// Cast the value to an object:
	obj = Object( value );

	// Walk the prototype chain collecting all property descriptors...
	desc = {};
	do {
		tmp = getOwnPropertyDescriptors( obj );
		keys = objectKeys( tmp );
		for ( i = 0; i < keys.length; i++ ) {
			// The first encountered property descriptor for a property name always takes precedence...
			if ( !hasOwnProp( desc, keys[ i ] ) ) {
				// The following is equivalent to `desc[ keys[i] ] = {...}`, but accounts for the possibility of a "poisoned" `Object` prototype (i.e., an `Object.prototype` having a property with a setter which throws).
				defineProperty( desc, keys[ i ], {
					'configurable': true,
					'enumerable': true,
					'writable': true,
					'value': tmp[ keys[ i ] ]
				});
			}
		}
		keys = getOwnPropertySymbols( tmp );
		for ( i = 0; i < keys.length; i++ ) {
			// The first encountered property descriptor for a symbol property always takes precedence...
			if ( !hasOwnProp( desc, keys[ i ] ) ) {
				// The following is equivalent to `desc[ keys[i] ] = {...}`, but accounts for the possibility of a "poisoned" `Object` prototype (i.e., an `Object.prototype` having a property with a setter which throws).
				defineProperty( desc, keys[ i ], {
					'configurable': true,
					'enumerable': true,
					'writable': true,
					'value': tmp[ keys[ i ] ]
				});
			}
		}
		obj = getPrototypeOf( obj );
	} while ( obj );

	return desc;
}
Returns an object's own and inherited property descriptors.

## Notes

-   In contrast to the built-in `Object.getOwnPropertyDescriptors()`, this function returns an empty object if provided `undefined` or `null`, rather than throwing an error.

@param {*} value - input object
@returns {Object} own and inherited property descriptors

@example
var obj = {
    'beep': 'boop',
    'foo': 3.14
};

var desc = propertyDescriptorsIn( obj );
// returns { 'beep': {...}, 'foo': {...}, ... }