Poor Large input first query performance

[Huararanga]

Summary

We are refactoring from V4.
When we use large inputs, we are observing poor pefrormance for first query.

Steps to reproduce

Follow steps in readme https://github.com/Huararanga/postgraphile-large-input

Expected results

Good pefrormance on first query call

Actual results

Poor pefrormance on first query call

Additional context

[Huararanga]

As @benjie suggested switching from

const $input = fieldArgs.get("input");

to

const $input = fieldArgs.getRaw("input");

fixed for this case