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Use the INTL_IDNA_VARIANT_UTS46 idn_to_ascii variant #192
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The default variant INTL_IDNA_VARIANT_2003 is deprecated in php 7.2.
The default will be changed to INTL_IDNA_VARIANT_UTS46 in php 7.4 so we should use that if it is defined.
This is similar to how it was changed in
Zend\Validator\EmailAddress
.