Namespace doesn't merge with expando function

[sandersn]

function ExpandoMerge(n: number) {
    return n;
}
ExpandoMerge.p1 = 111
ExpandoMerge.m = function(n: number) {
    return n + 1;
}
namespace ExpandoMerge {
    export var p2 = 222;
}

Expected behavior:
ExpandoMerge has properties p1, p2 and m.

Actual behavior:
Error on ExpandoMerge.m and namespace ExpandoMerge.

The error goes away if you delete ExpandoMerge.m. Might be because ExpandoMerge is no longer marked with JSContainer, and JSContainer somehow disallows namespace merging.

[sandersn]

Yes, JSContainer isn't excluded from ValueModuleExcludes, but should be.