What is the API equivalent of --experimental-wasm-reftypes

[Jeroen Ooms]

I am trying to backport a wasm tool to a legacy platform which has v8 version 9.1.269.38. On this platform, loading the wasm fails with an error: 

CompileError: WebAssembly.Module(): invalid value type 'externref', enable with --experimental-wasm-reftypes @+54

This looks like a command line flag for node/d8? How do I enable this feature using the C++ API? My bindings are here: https://github.com/jeroen/V8/blob/master/src/bindings.cpp

[Jeroen Ooms]

Or alternatively, is there a flag I can pass to GN or ninja when
building v8 to enable this feature by default?

[Clemens Backes]

You can set flags by calling `V8::SetFlagsFromString` before `V8::Initialize`.

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Clemens Backes

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