Fixes explicit bool.

Author: matteobortolazzo

src/CouchDB.Driver/ExpressionVisitors/WhereExpressionVisitor.cs

@@ -20,6 +20,16 @@ protected override Expression VisitMethodCall(MethodCallExpression m)
             return base.VisitMethodCall(m);
         }
 
+        protected override Expression VisitBinary(BinaryExpression expression)
+        {
+            if (expression.Right is ConstantExpression c && c.Type == typeof(bool) && 
+                (expression.NodeType == ExpressionType.Equal || expression.NodeType == ExpressionType.NotEqual))
+            {
+                return expression;
+            }
+            return base.VisitBinary(expression);
+        }
+
         protected override Expression VisitMember(MemberExpression expression)
         {
             if (IsWhereBooleanExpression(expression))

tests/CouchDB.Driver.UnitTests/Find/Find_Selector.cs

@@ -98,5 +98,17 @@ public void Variable_Bool_ExplicitFalse()
             var json = rebels.Where(r => r.IsJedi == false).OrderBy(r => r.IsJedi).ToString();
             Assert.Equal(@"{""selector"":{""isJedi"":false},""sort"":[""isJedi""]}", json);
         }
+        [Fact]
+        public void Variable_Bool_ExplicitNotTrue()
+        {
+            var json = rebels.Where(r => r.IsJedi != true).OrderBy(r => r.IsJedi).ToString();
+            Assert.Equal(@"{""selector"":{""isJedi"":{""$ne"":true}},""sort"":[""isJedi""]}", json);
+        }
+        [Fact]
+        public void Variable_Bool_ExplicitNotFalse()
+        {
+            var json = rebels.Where(r => r.IsJedi != false).OrderBy(r => r.IsJedi).ToString();
+            Assert.Equal(@"{""selector"":{""isJedi"":{""$ne"":false}},""sort"":[""isJedi""]}", json);
+        }
     }
 }