fixed; strict mode warning

closes #1686
fixed; doc.equals w/ _id false

closes #1687
fixed; repopulating modified populated paths

closes #1697
release 3.6.20
fixed; strict mode warning

closes #1686
fixed; doc.equals w/ _id false

closes #1687
fixed; repopulating modified populated paths

closes #1697
release 3.6.20
Merge branch '3.6.x' into gh-pages
website; 3.6.20