"No coercion operator is defined between types" when using "in" for a nullable Int property

[russelg]

.net 8.0, Breeze 7.3.0.
I get the following error when I try to use "in" for a property that is a nullable Int32:

No coercion operator is defined between types 'System.Collections.Generic.List`1[System.Int32]' and 'System.Nullable`1[System.Int32]'.
   at System.Linq.Expressions.Expression.GetUserDefinedCoercionOrThrow(ExpressionType coercionType, Expression expression, Type convertToType)
   at Breeze.Core.BinaryPredicate.BuildBinaryExpr(Expression expr1, Expression expr2, Operator op)
   at Breeze.Core.BinaryPredicate.ToExpression(ParameterExpression paramExpr)
   at Breeze.Core.BasePredicate.ToLambda(Type entityType)
   at Breeze.Core.QueryBuilder.ApplyWhere(IQueryable source, Type elementType, BasePredicate predicate)
   at Breeze.Core.EntityQueryExtensions.ApplyWhere(EntityQuery eq, IQueryable queryable, Type eleType)
   at Breeze.AspNetCore.BreezeQueryFilterAttribute.OnActionExecuted(ActionExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Filters.ActionFilterAttribute.OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|26_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

Query:

{"where":{"ObjectiveId":{"in":[2886,2888]}}}

Entity:

public class LabelLocation
{
    public int LabelLocationId { get; set; }
    public int LabelId { get; set; }
    public int? ObjectiveId { get; set; }

    public virtual Label Label { get; set; }
    public virtual Objective Objective { get; set; }
}

Ran into this while porting a codebase from .NET Framework 4.8/EF6/ASP.NET to .NET 8.0/EF Core/ASP.NET Core.
The ints are nullable in the old codebase, but this query succeeds successfully in that codebase, albeit the query is OData and not JSON.

[steveschmitt]

Ah, we must be handling the nullables incorrectly. Thanks for finding this.