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Fix PHPStan crashing with single value enum #1415

Job	Run time
Coding Standard	19s
PHPStan (8.2)	25s
PHPStan (8.1)	23s
PHPStan (8.4)	28s
Lint (8.3)	14s
Lint (7.4)	13s
PHPStan (8.3)	24s
Lint (8.0)	20s
PHPStan (8.3, composer require --dev doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctri...	1m 30s
PHPStan (8.0)	1m 12s
Lint (8.4)	15s
Lint (8.1)	14s
Lint (8.2)	14s
PHPStan (7.4)	28s
Tests (8.0, lowest)	1m 25s
Tests (8.1, highest)	1m 28s
Tests (8.4, lowest)	1m 24s
Tests (7.4, highest)	3m 6s
Tests (8.2, highest)	1m 28s
Tests (8.1, lowest)	1m 20s
Tests (7.4, lowest)	1m 33s
Tests (8.4, highest)	1m 28s
Tests (8.0, highest)	1m 35s
Tests (8.2, lowest)	1m 21s
Tests (8.3, highest, composer config extra.patches.doctrine/orm --json --merge '["compatibility/p...	1m 26s
Tests (8.3, lowest)	1m 27s
Tests (8.3, highest)	1m 25s
	27m 5s

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