I'm experimenting with adding web workers and pthreads to my project. I've 
got some simple test code that attempts to modify objects defined in the 
global scope in a web worker or a pthread. 

When the code that modifies the object runs in the WW I get 
"_emval_take_value has unknown type d". My run_in_worker() function, where 
this error occurs, works fine as long as I call it directly. It's only when 
I attempt to post it to the worker that the binding error manifests.

In the pthread version it seems that some JavaScript val objects 
representing DOM elements for various html tags that are defined in the 
main thread do not get defined in the pthread. So we get "Cannot read 
properties of undefined (reading 'value')" when trying to modify them in 
the pthread. There are also some oddities about printf, cout, and 
console.log where some messages that have supposedly printed do not show up 
in the console output. Anyone know what all this is about and how to fix it?

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