VTL - General purpose operators

Name	Symbol	Supported
Parentheses	( )	✔️
Persistent assignment	<-	✔️
Temporary assignment	:=	✔️
Membership	#	✔️
User-defined operator call		✔️
Evaluation of an external routine	eval	❌
Type conversion (string, integer, double, boolean)	cast	✔️
Type conversion (others)	cast	❌