Wrong nullable value type expression decompilation

[wwh1004]

input:

Guid? a = null;
Guid? b = null;
var expr = (Expression<Func<bool>>)(() => a == b);

ilspy output:

Guid? a = null;
Guid? b = null;
Expression<Func<bool>> expr = () => (Guid)a == (Guid)b;

they are different semantic

stloc expression(ILFunction.ET[System.Linq.Expressions.Expression`1[[System.Func`1[[System.Boolean]]]]] {
	
	BlockContainer {
		Block IL_0000 (incoming: 1) {
			leave IL_0000 (call op_Equality(ldloc a, ldloc b))
		}

	}
}
)
stloc expression2(ILFunction.ET[System.Linq.Expressions.Expression`1[[System.Func`1[[System.Boolean]]]]] {
	
	BlockContainer {
		Block IL_0000 (incoming: 1) {
			leave IL_0000 (call op_Equality(expression.tree.cast System.Guid(ldloc a), expression.tree.cast System.Guid(ldloc b)))
		}

	}
}
)

but ilspy will decompile them to the same code

Expression<Func<bool>> expr = () => (Guid)a == (Guid)b;
Expression<Func<bool>> expr2 = () => (Guid)a == (Guid)b;

ilspy version: 7.0.0.6306-preview2

[wwh1004]

https://docs.microsoft.com/en-us/dotnet/api/system.linq.expressions.binaryexpression.isliftedtonull?view=net-5.0
liftToNull is different with lift
liftToNull means return value is also nullable

ILSpy/ICSharpCode.Decompiler/IL/Transforms/TransformExpressionTrees.cs

Lines 734 to 738 in 06bae54

	if (isLifted != 0)
	{
	method = CSharpOperators.LiftUserDefinedOperator((IMethod)method);
	}
	return (() => new Call((IMethod)method) { Arguments = { left(), right() } }, method.ReturnType);

i think this should be updated