public void AssertTypeCode(GroBufTypeCode expectedTypeCode)
{
Il.Ldloc(TypeCode); // stack: [typeCode]
Il.Ldc_I4((int)expectedTypeCode); // stack: [typeCode, expectedTypeCode]
var okLabel = Il.DefineLabel("ok");
Il.Beq(okLabel);
SkipValue();
Il.Ret();
Il.MarkLabel(okLabel);
}