调用Navigator.pushAndRemoveUntil或Navigator.pushReplacement时，这两处断言会失败。虽然有BoostNavigator.pushReplacement方法，但是改造成本比较大。且，没有BoostNavigator.pushAndRemoveUntil方法，无法进行清栈处理。怎么解？
boost:4.0.4(前几个版本应该也差不多的情况)
flutter:3.3.1(前几个版本应该也差不多的情况)

// Route is removed without being completed.
void remove({ bool isReplaced = false }) {
assert(
!hasPage || isWaitingForExitingDecision,
'A page-based route cannot be completed using imperative api, provide a '
'new list without the corresponding Page to Navigator.pages instead. ',
);
......
}

// Route completes with result and is removed.
void complete(T result, { bool isReplaced = false }) {
assert(
!hasPage || isWaitingForExitingDecision,
'A page-based route cannot be completed using imperative api, provide a '
'new list without the corresponding Page to Navigator.pages instead. ',
);
......
}

据排查，发现当前页面是BoostPage时，hasPage==true，所以断言失败