true()
false()
number("1.5")
number('abc')
-number('abc')
floor(0.1)
floor(-0.1)
floor(-0)
floor(0)
floor(5.2)
floor(-5.2)
ceiling(0.1)
ceiling(-0.1)
ceiling(-0)
ceiling(0)
ceiling(5.2)
ceiling(-5.2)
round(0.1)
round(5.2)
round(5.5)
round(5.6)
round(-0.1)
round(-5.2)
round(-5.5)
round(-5.6)