un33k / python-ipware / 35781147817

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Deep-review fixes: exact/boundary proxy matching, deterministic header folding, config validation (#30)

- proxy_list: complete IPs match exactly (v3 prefix-matched, so 1.2.3.4
  trusted 1.2.3.45); prefixes match on octet/group boundaries; IPv6 entries
  case/zero-insensitive; mapped/NAT64 CIDRs match unwrapped IPv4 hops.
- Folded header keys: dash spelling wins regardless of dict order, so a
  client underscore header cannot shadow the proxy's; conflicts -> absent.
- Constructor rejects bare-string proxy_list/precedence, non-IP entries,
  bool/non-int proxy_count; copies caller lists. Non-mapping meta -> TypeError.
- RFC 7239 Forwarded parsing is quote-aware (no smuggled hops).
- Tiers: 0.0.0.0/8 rejected; fec0::/10 and 64:ff9b:1::/48 private.
- Remove dead is_valid_ip.
- Tests: new tests_modern_config.py, wider matrix configs (IPv6, two-hop,
  count/list mismatch); 100% line+branch coverage of modern engine.

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