Fails on large definitions

Hi there, I'm trying to read [Cloudflare's](https://github.com/cloudflare/api-schemas/) API definitions into this package but it's about 5MB and `json_decode()` definitely doesn't like working with files that big. Does anyone have any suggestions for how to read in such a large file, or would the devs be open to replacing the stock `json_decode()` with a reader that can handle larger files?

Thanks!