gistfile1.txt

diff --git a/src/binder/container.c b/src/binder/container.c
index 1853ec8..70b297e 100644
--- a/src/binder/container.c
+++ b/src/binder/container.c
@@ -87,7 +87,7 @@ void Rakudo_cont_store(PARROT_INTERP, PMC *cont, PMC *value,
             if (!PMC_IS_NULL(scalar->descriptor)) {
                 Rakudo_ContainerDescriptor *desc = ((Rakudo_ContainerDescriptor *)PMC_data(scalar->descriptor));
                 ok = STABLE(value_decont)->type_check(interp, value_decont, desc->of);
-                if (!ok) {
+                if (!ok && desc->of != Rakudo_types_mu_get()) {
                     Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
                         "Type check failed in assignment to '%S'; expected '%S' but got '%S'",
                         desc->name, typename(interp, desc->of), typename(interp, value_decont));