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Booleans in Dart
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type 'Future<bool>' is not a subtype of type 'bool' after restart · Issue #42614 · flutter/flutter · GitHub
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Dart Apprentice - Part II
🎯 Dart (DartLang) Introduction: Variables and Data Types | by Uday Hiwarale | RunDart | Medium
popup - Flutter: The argument type 'Future<bool?> Function()' can't be assigned to the parameter type 'Future<bool> Function()?' - Stack Overflow
Dart Operators
