docs: private static boolean floatingPointArgument(ExpressionTree tree) {
      if (tree.getKind() == Kind.UNARY_PLUS || tree.getKind() == Kind.UNARY_MINUS) {
        tree = ((UnaryTree) tree).getExpression();
      }
      return tree.getKind() == Kind.DOUBLE_LITERAL || tree.getKind() == Kind.FLOAT_LITERAL;
    }