Compiled metadata.osl -> metadata.oso
surface "metadata"
		metadata: string description = "everything is awesome"
    "myparam1" "int"
		Default value: 1
		metadata: int i = 0
		metadata: float f = 1
		metadata: string s = "foo"
    "myparam2" "int"
		Default value: 2
		metadata: string[2] s = "foo" "bar"
    "myparam3" "int"
		Default value: 3
		metadata: float[2] minmax = 42 44
    "myparam4" "int"
		Default value: 4
		metadata: color c = 1 2 3
    "myparam5" "int"
		Default value: 5
		metadata: string s = "I have\n\"Escape\"\tsequences\n"
