64-bit fix: make request IDs strings instead of raw numbers
64-bit fix: make request IDs strings instead of raw numbers

On 64-bit platforms JS can't handle the integers, so IDs were getting
mangled before being sent back with the result. A string preserves
across language boundaries perfectly.

skeeto/skewer-mode,kostafey/skewer-mode,emacsmirror/skewer-mode,emacsmirror/skewer-mode,syohex/skewer-mode,kostafey/skewer-mode,skeeto/skewer-mode,syohex/skewer-mode