Test #1: "+2" compares as a string

Test #2: "+2a" compares as a string

Test #3: "+2 " compares as a string

Test #4: " 2" compares as a string

after addition

Test #5: "+2" compares as a string

Test #6: "+2a" compares as a string

Test #7: "+2 " compares as a string

Test #8: " 2" compares as a string

Test #9: "3e5" <= "5"

Test #10: test

Test #11: test

Test #12: 1.500000 1.500000e+00

Test #13: nomatch

Test #14: 1:2,3

Test #15: 4