avoid specializing convert for Any result types (superseding #25) #27
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Specializing `convert(Result{Any, E}, x)` for every type of `x` can
incur substantial compilation overhead (not only on `convert` but also
on `Some`). This change avoids specializing in case of explicit `Any`
result type.
This is analogous to Julia Base where we have
```
convert(::Type{Any}, Core.@nospecialize x) = x
```
to avoid excessive specialization.
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convertforAnyresult types