chore: add doc

packages/utils/numbers.ts

@@ -1,3 +1,8 @@
+/**
+ * Due to browser rendering and calculation precision loss issues,
+ * boundary checks cannot be based solely on value equality;
+ * a certain range of fluctuation is permissible.
+ */
 export function isGreaterThan(a: number, b: number, epsilon = 0.03) {
   return a - b > epsilon
 }