Words, precision
and power.

Why `"abc" is "abc"` Is True But `"hello world" is "hello world"` Might Not Be — String Interning, Ropes, and Concatenation Complexity

String interning stores only one copy of each distinct string and reuses references — which is why Python's `"abc" is "abc"` can be True while `"hello world" is "hello world"` may be False. Here's V8's internal ConsString lazy concatenation representation, why `result += "abc"` in a million-iteration loop is O(n²) while `"abc" * 1000000` is O(n), how rope data structures make text editor string operations efficient, and why using a repeated string to test a VARCHAR column reveals silent truncation bugs.