The following review has been posted through the commitfest application:make installcheck-world: not testedImplements feature: not testedSpec compliant: not testedDocumentation: not tested
For whatever it is worth, the patch looks good to me.
A minor nitpick would be to use a verb in the part:
`cost when the parameter in (0, 1)`
`cost when the parameter's value is in (0, 1)` or similar.
Apart from that, I would suggest it that the patch could be moved toWaiting for Author state.