Motion Blur changes - How do they translate?

[Whispermode]

Motion Blur is now a percentage for 'Internal'.

Does this simply relate to shutter angle now as a percentage? i.e. 50% = 180 degrees?

I had got quite comfortable with a previous setting of 0.02 or 0.03 (although no idea what that actually meant).

Is there a description anywhere?

Thanks!

[J.C]

Official manuals are not updated and manual for Standalone is also missing an information on this matter too.

Dear developers can you share the secret how to use this?