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Because we evaluate ST instance by invoking
Interpreter#exec(STWriter,InstanceScope) again, we can't pass options in.
So the
Bytecode#INSTR_WRITE instruction of an applied template
(such as when we wrap in between template applications like
]}; wrap>}) we need to write the
wrap string
before calling
Interpreter#exec. We expose just like for the
separator. See
Interpreter#writeObject where it checks for ST
instance. If POJO,
Interpreter#writePOJO passes
wrap to
STWriter#write(String str,String wrap). Can't pass to
Interpreter#exec.