Other qualifiers supported

There are other types of qualifiers supported such as tags, brackets, braces and parenthesis. It appears others make the function return null.Declare @String varchar(30) = 'Some String'Select 'Tag'as Type , Quotename(@String,'<') QuotedValueUnion All Select 'Parentheses' , Quotename(@String,'(')Union All Select 'Brace' , Quotename(@String,'{')Union All Select 'Bracket' , Quotename(@String,'[')Union All Select 'Tick' , Quotename(@String,'''')Union All Select 'Dot' , Quotename(@String,'.')Res