[ACTIVEMODEL] Use ActiveRecord#instantiate when populating ActiveRecord documents
[ACTIVEMODEL] Use ActiveRecord#instantiate when populating ActiveRecord documents

NOTE: Using ActiveRecord's private `instantiate`
method, which has been there since pre-1.0 days so
it's safe to assume that it's stable.

Telmate/tire,tklee/tire_shiphawk,ChapterMedia/tire,mavenlink/retire,iamrahulroy/retire,1776/tire,brijeshgpt7/retire,dbose/retire,alphagov/tire,zaharpecherin/retire,fabn/retire,doximity/tire,rubydubee/retire,fcheung/tire,elbuo8/retire,karmi/retire,fairfaxmedia/tire,mikepb/tire,HenleyChiu/tire