From c1ca79bc3ecb5dd5110ccba9b21fec8c657f9f06 Mon Sep 17 00:00:00 2001
From: George MacKerron <george@mackerron.co.uk>
Date: Sun, 23 Jun 2024 14:06:44 +0100
Subject: [PATCH] Custom JSON parsing: return *all* unsafe integers as strings,
 even if numeric representation as string is the same

---
 src/db/customJSON.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/db/customJSON.ts b/src/db/customJSON.ts
index 1ae2dfc..2ea1b55 100644
--- a/src/db/customJSON.ts
+++ b/src/db/customJSON.ts
@@ -12,10 +12,13 @@ export function enableCustomJSONParsingForLargeNumbers(pg: typeof pgLib) {
   pg.types.setTypeParser(pg.types.builtins.JSONB, parseJSONWithLargeNumbersAsStrings);
 }
 
+const { MAX_SAFE_INTEGER, MIN_SAFE_INTEGER } = Number;
+
 function parseJSONWithLargeNumbersAsStrings(str: string) {
   return parse(str, undefined, function (k, str) {
     const n = +str;  // JSON parser ensures this is an ordinary number, parseInt(str, 10) not needed
     if (n === Infinity || n === -Infinity) return str;
+    if ((n < MIN_SAFE_INTEGER || n > MAX_SAFE_INTEGER) && str.indexOf('.') === -1) return str;
     if (str.length <= 15 || numericStringToExponential(str) === n.toExponential()) return n;
     return str;
   });