Can somebody explain me the logic behind this ?

I was going crazy to understand why a circle has this behaviour

and Honestly for me its a bug

We are used to a circle domain (0- 2 pi) or (0.0 - 1.0)

The domain on a circle reports correctly (0 -2 pi )

but evaluate at parameter pi is not where you think.

Another strange behaviour, If you scale a circle the point at same parameter moves

to another position.

gd