A SassScript object representing a CSS string or a CSS identifier.
@return [Symbol] `:string` or `:identifier`
@return [String]
Creates a new string.
@param value [String] See \{value} @param type [Symbol] See \{type}
In addition to setting the \{context} of the string, this sets the string to be an identifier if the context is `:equals`.
@see Node#context=
@see Literal#plus
@see Node#to_s
@see Node#to_sass
[Validate]