Reject Unsafe Integer Quantities Before Summing Order Imports

A developer article argues that order importers can reject negative quantities yet still silently lose exact counts in JavaScript. Ordinary numbers only represent safe integers reliably, and large decimal strings or JSON numbers can lose precision before validation runs. The article presents a standalone example that accepts safe positive numbers or canonical decimal strings while rejecting whitespace, signs, fractions and leading zeros. It stresses that individually valid quantities can still overflow when summed, so both lines and totals must be checked. The author notes that such string rules are an interface choice rather than a universal warehouse standard, and that quantity checks do not confirm stock or allocation.