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Zaven Muradyan 3d8799b3a2 fix(router): avoid freezing queryParams in-place (#22663 )

The recognizer code used to call Object.freeze() on queryParams before
using them to construct ActivatedRoutes, with the intent being to help
avoid common invalid usage. Unfortunately, Object.freeze() works
in-place, so this was also freezing the queryParams on the actual
UrlTree object, making it more difficult to manipulate UrlTrees in
things like UrlHandlingStrategy.

This change simply shallow-copies the queryParams before freezing them.

Fixes #22617

PR Close #22663

2018-05-10 07:54:11 -07:00