========================
Expression: true()
Object is a Boolean : true
========================
Expression: false()
Object is a Boolean : false
========================
Expression: number("1.5")
Object is a number : 1.5
========================
Expression: concat("titi",'toto')
Object is a string : tititoto
========================
Expression: concat("titi",'toto',"tata","last")
Object is a string : tititototatalast