/scratch/workspace/artdaq_demo-release-build/SLF6/s50-e14-debug/build/artdaq_node_server/v1_00_09/src/node_modules/xml2js/node_modules/xmlbuilder/node_modules/lodash/keys.js
function Foo() { this.a = 1; this.b = 2; }
Foo.prototype.c = 3;
_.keys(new Foo); // => ['a', 'b'] (iteration order is not guaranteed)
_.keys('hi'); // => ['0', '1']