feat: prevent minus sign typing #1291

Job	Run time
Floating Dependencies	50s
Tests	50s
Type checking - [email protected]	51s
ember-try: ember-lts-3.28	53s
Type checking - [email protected]	54s
Type checking - [email protected]	48s
Type checking - typescript@next	48s
ember-try: ember-lts-4.4	1m 4s
ember-try: ember-lts-4.8	1m 11s
ember-try: ember-lts-4.12	1m 4s
ember-try: ember-release	51s
ember-try: ember-beta	54s
ember-try: ember-canary	54s
ember-try: ember-classic	1m 49s
ember-try: embroider-safe	1m 10s
ember-try: embroider-optimized	1m 1s
	15m 52s

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