PHPStan output:
```
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https://we.phorge.it/source/phorge/browse/master/src/applications/drydock/customfield/DrydockBlueprintCoreCustomField.php
31 Method DrydockBlueprintCoreCustomField::readValueFromObject() should return this but return statement is missing.
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https://we.phorge.it/source/phorge/browse/master/src/applications/harbormaster/customfield/HarbormasterBuildStepCoreCustomField.php
61 Method HarbormasterBuildStepCoreCustomField::readValueFromObject() should return this but return statement is missing.
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https://we.phorge.it/source/phorge/browse/master/src/applications/people/customfield/PhabricatorUserBlurbField.php
41 Method PhabricatorUserBlurbField::readValueFromObject() should return this but return statement is missing.
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https://we.phorge.it/source/phorge/browse/master/src/applications/people/customfield/PhabricatorUserIconField.php
41 Method PhabricatorUserIconField::readValueFromObject() should return this but return statement is missing.
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https://we.phorge.it/source/phorge/browse/master/src/applications/people/customfield/PhabricatorUserRealNameField.php
41 Method PhabricatorUserRealNameField::readValueFromObject() should return this but return statement is missing.
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https://we.phorge.it/source/phorge/browse/master/src/applications/people/customfield/PhabricatorUserTitleField.php
41 Method PhabricatorUserTitleField::readValueFromObject() should return this but return statement is missing.
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https://we.phorge.it/source/phorge/browse/master/src/applications/differential/customfield/DifferentialCoreCustomField.php
84 Method DifferentialCoreCustomField::readValueFromObject() should return this but return statement is missing.
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```
`abstract class DifferentialCoreCustomField extends DifferentialCustomField`.
`abstract class DifferentialCustomField extends PhabricatorCustomField`.
https://we.phorge.it/source/phorge/browse/master/src/infrastructure/customfield/field/PhabricatorCustomField.php$440-452 returns `$this`.
But none of its in total seven child class implementations returns any value.
Thus I assume the method definition in parent `PhabricatorCustomField` is wrong.