Glyphs default PS hint settings

1

Does Glyphs build in the default values for
blueFuzz
blueShift
blueScale
or should they be manually set as Custom Parameters, even if the default values are required?

2

The defaults are:
blueFuzz = 0
blueShift = 0.007 * UPM
blueScale = 0.037

3

Why do you set blueScale to 0.037?
The Type 1 spec says the default is 0.039625.
Has this changed?

4

For some reason I liked that better. I did that 10 years ago.