IDNA_USE_STD3_RULES

IDNA_USE_STD3_RULES is one of the accepted parameters for:

• idn_to_ascii parameter #2 (optionally as a bitmask)
• idn_to_utf8 parameter #2 (optionally as a bitmask)

IDNA_USE_STD3_RULES — Check if the input for IDN functions conforms to domain name ASCII rules.

IDNA_USE_STD3_RULES = 2;