Fix in Node 4 & 5 "const" has no for-in scope in Node 4 and 5 https://kangax.github.io/compat-table/es6/#test-const_for-in_loop_iteration_scope
Fix in Node 4 & 5
"const" has no for-in scope in Node 4 and 5
https://kangax.github.io/compat-table/es6/#test-const_for-in_loop_iteration_scope

w3c/specberus,w3c/specberus,w3c/specberus