Make Numeric#step compliant
Cleanup Numeric#coerce
Make Numeric#downto compliant
Cleanup Numeric#abs
Cleanup Numeric#ceil
Cleanup Numeric#chr
Cleanup Numeric#even?
Cleanup Numeric#floor
Cleanup Numeric#hash
Cleanup Numeric#integer?
Cleanup Numeric#next
Cleanup Numeric#nonzero?
Cleanup Numeric#odd?
Cleanup Numeric#pred