Avoid using any IDNA constants in the internal polyfill implementation #281
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Fixes #278.
Sometimes we can get into an awkward configuration where
ext-intl
is enabled, but is compiled with a version of ICU < 4.6, which means that a number of constants aren't defined and the polyfill doesn't get loaded and therefore doesn't define the constants for us. This causes breakage for users using the internal API. Fix this by avoiding the use of anyIDNA_*
constants.@bmack let me know if this fixes the issue for you.