fix(runtime-core): modifier .trim compatibility (fix #6711)

[zhangpaopao0609]

issue

v-model.trim: incompatible trim() when emit arg is not string #6711

solution

If the emit's arg type is string, a.trim() is returned like before, if it is not, a is directly returned.

[sqal]

duplicate #5770

I don't think Vue should show a warning (even during development) if the value is not a string. It will probably just confuse people as to whether they can/cannot pass any type of value to the emit function.

[zhangpaopao0609]

duplicate #5770

I don't think Vue should show a warning (even during development) if the value is not a string. It will probably just confuse people as to whether they can/cannot pass any type of value to the emit function.

That's right, this does cause such problems, thanks. I have removed that tip and leaving only the logic

[zhangzhonghe]

duplicate #5770
I don't think Vue should show a warning (even during development) if the value is not a string. It will probably just confuse people as to whether they can/cannot pass any type of value to the emit function.

That's right, this does cause such problems, thanks. I have removed that tip and leaving only the logic

已经有人提过 PR 了，和你的修改一样。