Merge pull request #277 from davidtaylorhq/source-map-default #808

Job	Run time
Tests	26s
Linting	22s
Floating Deps	23s
ember-3.27	39s
Tests: Node	25s
ember-4.12	38s
Tests: macos	42s
ember-release	39s
Tests: windows	1m 42s
ember-beta	37s
ember-canary	45s
embroider-safe-min-supported	44s
embroider-optimized-min-supported	43s
embroider-safe-release	42s
embroider-optimized-release	41s
	10m 8s

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