QUICKFILTER=rating help please

The following will give a result and show 4 stars and 5 stars (even though it should be showing only 5 stars):

Set QUICKFILTERFLAGS=evalon,regexpoff,partialon,anywordon,ignorediacriticsoff
Set QUICKFILTER=rating>4

These on the other hand do nothing:

Set QUICKFILTERFLAGS=evalon,regexpoff,partialon,anywordon,ignorediacriticsoff
Set QUICKFILTER=rating=4
Set QUICKFILTERFLAGS=evalon,regexpoff,partialon,anywordon,ignorediacriticsoff
Set QUICKFILTER=rating==4
Set QUICKFILTERFLAGS=evalon,regexpoff,partialon,anywordon,ignorediacriticsoff
Set QUICKFILTER=rating:4

help please.

The five rating levels are

1, 25, 50, 75, 99

An empty string represents zero stars.

Awesome. Many thanks. (Is that documented somewhere ?)