Make operator == override parameters non-nullable (#677)

* Make operator == override parameters no-nullable. See dart-lang/linter#3441

Work towards dart-lang/sdk#51038.

Author: srawlins

packages/reactive_ble_platform_interface/lib/src/model/discovered_characteristic.dart

@@ -38,7 +38,8 @@ class DiscoveredCharacteristic {
       (((17 * 37) + characteristicId.hashCode) * 37 + serviceId.hashCode) * 37;
 
   @override
-  bool operator ==(dynamic other) =>
+  bool operator ==(Object other) =>
+      other is DiscoveredCharacteristic &&
       runtimeType == other.runtimeType &&
       characteristicId == other.characteristicId &&
       serviceId == other.serviceId;

packages/reactive_ble_platform_interface/lib/src/model/qualified_characteristic.dart

@@ -31,7 +31,8 @@ class QualifiedCharacteristic {
       deviceId.hashCode;
 
   @override
-  bool operator ==(dynamic other) =>
+  bool operator ==(Object other) =>
+      other is QualifiedCharacteristic &&
       runtimeType == other.runtimeType &&
       characteristicId == other.characteristicId &&
       serviceId == other.serviceId &&

packages/reactive_ble_platform_interface/lib/src/model/unit.dart

@@ -5,7 +5,7 @@ class Unit {
   const Unit();
 
   @override
-  bool operator ==(dynamic other) => other.runtimeType == runtimeType;
+  bool operator ==(Object other) => other.runtimeType == runtimeType;
 
   @override
   int get hashCode => 1;

packages/reactive_ble_platform_interface/lib/src/model/uuid.dart

@@ -68,7 +68,8 @@ class Uuid {
       data.fold(17, (hash, octet) => 37 * hash + octet.hashCode);
 
   @override
-  bool operator ==(dynamic other) =>
+  bool operator ==(Object other) =>
+      other is Uuid &&
       other.runtimeType == runtimeType &&
       const DeepCollectionEquality().equals(other.data, data);
 }