Why Python Never Overflows: The Secret of Arbitrary‑Precision Integers

Unlike fixed‑size integers in languages like C or Java, Python uses arbitrary‑precision integers that automatically expand, preventing overflow; this article explains the underlying CPython implementation, demonstrates the behavior with examples, and discusses the memory and performance trade‑offs of such limitless integers.

Arbitrary PrecisionCPythonPython

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Why Python Never Overflows: The Secret of Arbitrary‑Precision Integers

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Jun 27, 2025 · Fundamentals

Why Does num === num - 1 Sometimes Return True in JavaScript?

This article explains the special cases where the JavaScript expression num === num - 1 evaluates to true, covering Infinity, numbers beyond the safe integer range, how to detect unsafe values, and practical solutions using Number.isSafeInteger, BigInt, bignumber.js, and a custom big‑integer addition implementation.

Arbitrary PrecisionBIGINTInfinity

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Why Does num === num - 1 Sometimes Return True in JavaScript?