Function parseNonNegInt

scripts/github-actions/post-review-comments.js:733–736

(val, defaultVal)

// `parseInt || default` would let a nonsensical negative value bypass the
// fallback.
function parseNonNegInt(val, defaultVal) {
  const n = parseInt(val, 10);
  return Number.isFinite(n) && n >= 0 ? n : defaultVal;
}

// Case-insensitive header lookup. Octokit normalizes response headers to
// lowercase, but this defensive check also handles original casing so that