A null: null
Also a null: # Empty
Not a null: ""
Booleans: [ true, True, false, FALSE ]
Integers: [ 0, 0o7, 0x3A, -19 ]
Floats: [ 0., -0.0, .5, +12e03, -2E+05 ]
Also floats: [ .inf, -.Inf, +.INF, .NAN ]