Method code for $trie.keys()

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---

  1: arg trie, @prefix;
  2: var n, i, l;
  3: 
  4: [(prefix ?= "")] = prefix;
  5: l = trie[1] ? [prefix + trie[1][1]] : [];
  6: if (trie[2]) {
  7:     for i in [1 .. trie[2].length()]
  8:         l += .keys(trie[2 + i], prefix + trie[2][i]);
  9:     refresh();
 10: }
 11: return l;

---

// Miroslav Silovic
// Created 10-May-1995 as a part of ColdCore, see: @help Credit