getRules on boolean type returns differently when there are more than one operator

Hi, I am using filter with boolean type. I realise that 'getRules' doesn't work as expected when there are more than one operator.

The reason why i need two operators (ie. "equal" and "not_equal") because I have integrated your filter with the ability to input a dynamic value from somewhere else.
Thus it would be helpful if I can do
eg.

param_1 = "true"
test: field_1 equal param_1
test: field_1 not_equal param_1

Fiddle below:
Works - One operator, getRules return 1 or 0
https://jsfiddle.net/fh7q3Lz4/7/

Fail - Two operators, getRules return true or false
https://jsfiddle.net/fh7q3Lz4/8/

I have tested with an older version that works (ie. 2.4.3)
https://jsfiddle.net/fh7q3Lz4/9/

Start by comparing the working and failing jsFiddle reproductions, then check the 2.4.3 fiddle to identify how getRules handles boolean filters with one versus multiple operators. Done means getRules returns the expected rule representation for both the single-operator and multi-operator cases.