getNumberSymbol(sType) {
			assert(["group", "decimal", "plusSign", "minusSign"].includes(sType), "sType must be decimal, group, plusSign or minusSign");
			return mSettings["symbols-latn-" + sType];
		}
Returns the currently set number symbol of the given type or undefined if no symbol has been defined.

@param {"group"|"decimal"|"plusSign"|"minusSign"} sType the type of symbol
@returns {string} A non-numerical symbol used as part of a number for the given type,
  e.g. for locale de_DE:
    <ul>
      <li>"group": "." (grouping separator)</li>
      <li>"decimal": "," (decimal separator)</li>
      <li>"plusSign": "+" (plus sign)</li>
      <li>"minusSign": "-" (minus sign)</li>
    </ul>
@public
@since 1.120