code: function(paramSize, name) {
        var helper = this.setupHelper(paramSize, name);
        this.pushStack(helper.name + ".call(" + helper.callParams + ")");
      }
docs: [invokeKnownHelper]  On stack, before: hash, inverse, program, params..., ... On stack, after: result of helper invocation  This operation is used when the helper is known to exist, so a `helperMissing` fallback is not required.