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Fix PHPStan crashing with single value enum #1416

Job	Run time
Coding Standard	17s
Lint (8.0)	14s
Lint (8.2)	19s
Lint (7.4)	22s
Lint (8.1)	15s
Lint (8.4)	16s
PHPStan (7.4)	27s
PHPStan (8.1)	25s
Lint (8.3)	12s
PHPStan (8.0)	25s
PHPStan (8.3)	30s
PHPStan (8.3, composer require --dev doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctri...	26s
PHPStan (8.2)	31s
PHPStan (8.4)	22s
Tests (7.4, highest)	1m 41s
Tests (7.4, lowest)	1m 30s
Tests (8.0, highest)	1m 37s
Tests (8.0, lowest)	1m 26s
Tests (8.4, highest)	1m 28s
Tests (8.1, lowest)	1m 26s
Tests (8.3, lowest)	1m 23s
Tests (8.2, highest)	1m 29s
Tests (8.1, highest)	1m 32s
Tests (8.3, highest)	1m 29s
Tests (8.3, highest, composer config extra.patches.doctrine/orm --json --merge '["compatibility/p...	1m 27s
Tests (8.2, lowest)	1m 21s
Tests (8.4, lowest)	1m 16s
	24m 6s

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