AnyOutput.ApplyStringArray(func(value pulumi.StringArrayOutput) pulumi.StringArrayOutput {
   return value
})

Result in a panic with a stacktrace

May require a little tweaking. The signature might need to be

func(v interface{})

with an additional type assertion in there.

This ended up working for me:

.ApplyStringArray(func(v interface{}) ([]string, error) {
	v2 := v.([]interface{})
	var result []string
	for _, s := range v2 {
		result = append(result, s.(string))
	}
	return result, nil
})

I'm having most of my struggles with these custom pulumi types, once you learn how they're supposed to work it becomes easier to build the configurations, I think a lot of my struggles could've been solved if there were more practical examples. Some feedback for improving the docs.