Constant MAX_CHECKED_PARAMS 

pub const MAX_CHECKED_PARAMS: usize = 64;

The most parameters one element may have when repeated names are refused: RFC 9110 parameters under DuplicatePolicy::Refuse, authentication parameters, and MIME parameters. Their name offsets are kept on the stack, so a repeat is found by comparing names in place, never by reading the parameters again (D-072). Without it, the check for a repeat reads every earlier parameter, values included, and a field of many parameters costs the square of its length.

Examples

use parse_net::{param, DuplicatePolicy, ErrorKind, Limits};

let many: String = (0..65).map(|i| format!(";p{i}=v")).collect::<Vec<_>>().concat();
let wide = Limits::DEFAULT.max_params(1000);
assert_eq!(param::parse(many.as_bytes(), &wide).unwrap_err().kind(), ErrorKind::TooManyMembers);
// `First` and `Last` do not look for repeats, so `max_params` applies.
let last = wide.duplicate_params(DuplicatePolicy::Last);
assert_eq!(param::parse(many.as_bytes(), &last)?.0.len(), 65);
assert_eq!(param::MAX_CHECKED_PARAMS, 64);