Alan Agius f2ecb904a9 fix(@angular-devkit/build-angular): serve option merging is being overridden by defaults in schema (#15328)
We have a number of browser options that we allow the dev-server to merge. However, this only happens when such as options are undefined from the dev-server builder. At the moment these option have defaults inside their schema which results in them never being `undefined`, and hence the overridden logic is bypassed.

See: 6dd5b186d4/packages/angular_devkit/build_angular/src/dev-server/index.ts (L49-L63) and 6dd5b186d4/packages/angular_devkit/build_angular/src/dev-server/index.ts (L107-L115)

Fixes #15273 and fixes #15064
2019-08-14 17:55:04 -07:00
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