Arithmetic expression bug

[LdBeth]

*iZZZZZ`j``
*0A=``
90
*(0A*2)=``
180
*(0A+(0A))=``
180
*(0A==(0A))=``
0
*(0A==90)=``
0
*((0A)==(1A))=``
0

The last three expressions should give -1 (true)

this problem is specifically with variable in the formnA as other variables such as (Z==Z) does give expected results.