I am migrating my V8 code from using "plain scripts" to using "ES6 
Modules". There are a few concepts that I am struggling with. 

First, how might I retrieve a class definition defined in a module? 
Previously I would have used the "global" object on the "context" (i.e. 
context->Global()), and found the class definition there. I can't find a 
good example on how to do that in a module. I am experimenting with 
Module::GetModuleNamespace(), but I'm not sure that I'm on the right track.

Second, am I allowed to take a persistent handle to a module? I am finding 
that after restoring a module from a persistent handle, I encounter the 
failure below.

#
# Fatal error in C:\621300de\v8\src/api/api-inl.h, line 128
# Debug check failed: allow_empty_handle || that != nullptr.
#
#
#
#FailureMessage Object: 0000006114FBC2E0
==== C stack trace ===============================

        v8::base::debug::StackTrace::StackTrace [0x0,000,7FF,60D,F82,80B+27]
        v8::platform::DefaultPlatform::PostJob [0x0,000,7FF,60D,F7F,1E1+401]
        V8_Fatal [0x0,000,7FF,60C,251,B87+167]
        v8::base::PrintCheckOperand<unsigned __int64> 
[0x0,000,7FF,60C,251,683+627]
        v8::Module::GetStatus [0x0,000,7FF,60C,1E0,3FD+141]
        v8::Module::GetModuleNamespace [0x0,000,7FF,60C,1D1,243+19]

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