[fix] fixes for firing of hashchange event

[benmccann]

fixes for hashchange (#2588) which was implemented in the last PR (#2590)

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@sveltejs/kit	Patch

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[Conduitry]

As a personal style thing, I'd probably prefer to use slice rather than substring because I can never remember what the difference is between substring and substr - whereas slice is really easy for me to remember and works the same way as on arrays.

If other people feel differently, I don't feel particularly strongly about this.

[benmccann]

I'm the opposite, but maybe that's because I'd never heard of substr until today 😄 I can never remember what slice does because it's not in the other languages I use, but substring is the same in all of them