Verification builds:
1.1.0.9 Retail

Summary:
Iron Golems are knocked back when hit with an arrow fired from a Punch bow.

Steps to Reproduce:

1. Fire an arrow at an Iron Golem with a Punch 2 bow

Observed Results:
The Iron Golem gets knocked back

Expected Results:
Iron Golems are not supposed to be knocked back at all.

Screenshots/Videos attached: Yes

Notes:

• "Iron golems have 100% knockback resistance." (Wiki)
• "Iron golems now have full knockback resistance." (Changelog for 1.0 beta build 2)