Commands in functions can have preceding and trailing spaces and tabs.

      xp add @s 1 levels         
			tellraw @s {"text":"hello"}				
clear @s cobblestone 1                 

This can be conflicting in commands like /say, because it trims these characters.

say Look! I'm not displaying the trailing spaces and tabs!!    		

Preceding tabs and spaces may be intentional, because it then allows comments to be indented.