ng update force flag doesn't seem to force

[StephenFluin]

Versions

Angular CLI: 6.0.0-rc.0
Node: 9.9.0
OS: linux x64
Angular: 5.1.3
... animations, common, compiler, compiler-cli, core, forms
... http, platform-browser, platform-browser-dynamic
... platform-server, router, service-worker

@angular/cdk: 5.0.3
@angular/cli: 6.0.0-rc.0
@angular/material: 5.0.3
@angular-devkit/architect: 0.5.0
@angular-devkit/core: 0.5.0
@angular-devkit/schematics: 0.5.0
@ngtools/json-schema: 1.1.0
@schematics/angular: 0.5.0
@schematics/update: 0.5.0
typescript: 2.4.2
webpack: error

Repro steps

$ ng update --all -f
                  Package "angularfire2" has a missing peer dependency of "@firebase/app" @ "^0.1.6".
                  Package "@angular/compiler-cli" has an incompatible peer dependency to "typescript" (requires ">=2.4.2 <2.7", would install "2.8.1").
                  Package "@angular/compiler-cli" has an incompatible peer dependency to "typescript" (requires ">=2.4.2 <2.7", would install "2.8.1")
Incompatible peer dependencies found. See above.
stephen@cros-stretch:~/workspace/fluin.io$ ng update --all --force
                  Package "angularfire2" has a missing peer dependency of "@firebase/app" @ "^0.1.6".
                  Package "@angular/compiler-cli" has an incompatible peer dependency to "typescript" (requires ">=2.4.2 <2.7", would install "2.8.1")
                  Package "@angular/compiler-cli" has an incompatible peer dependency to "typescript" (requires ">=2.4.2 <2.7", would install "2.8.1").
Incompatible peer dependencies found. See above.

Desired behavior

ng update --all --force should perform the update despite the incorrect peer dependencies

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