6.2 Control Flags

The IDNA flags parameter can take on the following values, or a bit-wise inclusive or of any subset of the parameters:

Return code: Idna_flags IDNA_ALLOW_UNASSIGNED

Allow unassigned Unicode code points.

Return code: Idna_flags IDNA_USE_STD3_ASCII_RULES

Check output to make sure it is a STD3 conforming host name.

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