CompileException when mapping record with DateTime to class with optional constructor parameter

[moikot]

Mapping from a record containing a DateTime to a class with a constructor that has a default DateTime parameter causes a Mapster.CompileException.

Environment

Mapster version: 10.0.8-pre06
.NET version: net10.0

Repro

public class DateTimeFooDto
{
    public DateTime Timestamp { get; set; }

    public DateTimeFooDto(DateTime timestamp = default(DateTime))
    {
        this.Timestamp = timestamp;
    }
}

record DateTimeFoo(DateTime Timestamp);

public class DateTimeMappingTests
{
    [Fact]
    public void DateTimeMapping()
    {
        // Arrange
        var src = new DateTimeFoo(DateTime.Today);

        // Act
        var foo = src.Adapt<DateTimeFooDto>();

        // Assert
        foo.Timestamp.ShouldBe(src.Timestamp);
    }
}

Actual behavior

Throws:

Mapster.CompileException: Error while compiling
...
System.ArgumentException: Argument types do not match
   at System.Linq.Expressions.Expression.Constant(Object value, Type type)
...

Expected behavior

Mapping should succeed and foo.Timestamp should equal src.Timestamp.

It looks like there are several workarounds, but my problem is that I'm using a code generator and changing it will affect lot's of dependencies. So I have to use MapWith in such cases.

[DocSvartz]

@moikot This is a feature of the compiler and the Reflection API.
In such cases, the ParameterInfo.DefaultValue for such a parameter defined as null. 😅

[moikot]

@DocSvartz , I see. Thank you for the explanation!