fix: export coerceNumber, update stale docs using old Configuration.set() API

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: B4nan

docs/guides/parallel-scraping/parallel-scraper.mjs

@@ -73,15 +73,13 @@ if (!process.env.IN_WORKER_THREAD) {
     // or a configuration option. This is just for show 😈
     workerLogger.setLevel(log.LEVELS.DEBUG);
 
-    // Disable the automatic purge on start
-    // This is needed when running locally, as otherwise multiple processes will try to clear the default storage (and that will cause clashes)
-    Configuration.set('purgeOnStart', false);
-
     // Get the request queue
     const requestQueue = await getOrInitQueue(false);
 
-    // Configure crawlee to store the worker-specific data in a separate directory (needs to be done AFTER the queue is initialized when running locally)
+    // Disable the automatic purge on start and configure crawlee to store the worker-specific data in a separate directory
+    // (needs to be done AFTER the queue is initialized when running locally)
     const config = new Configuration({
+        purgeOnStart: false,
         storageClientOptions: {
             localDataDirectory: `./storage/worker-${process.env.WORKER_INDEX}`,
         },

docs/guides/parallel-scraping/parallel-scraping.mdx

@@ -132,22 +132,19 @@ We use this to ensure the parent process stays alive until all the worker proces
 
 There are three steps we want to do for the worker processes:
 
-- ensure the default storages do **not** get purged on start, as otherwise we'd lose the queue we prepared
 - get the queue that supports locking from the same location as the parent process
-- initialize a special storage for worker processes so they do not collide with each other
+- ensure the default storages do **not** get purged on start, as otherwise we'd lose the queue we prepared, and initialize a special storage for worker processes so they do not collide with each other
 
 In order, that's what these lines do:
 
 ```javascript title="src/parallel-scraper.mjs"
-// Disable the automatic purge on start (step 1)
-// This is needed when running locally, as otherwise multiple processes will try to clear the default storage (and that will cause clashes)
-Configuration.set('purgeOnStart', false);
-
-// Get the request queue from the parent process (step 2)
+// Get the request queue from the parent process (step 1)
 const requestQueue = await getOrInitQueue(false);
 
-// Configure crawlee to store the worker-specific data in a separate directory (needs to be done AFTER the queue is initialized when running locally) (step 3)
+// Disable the automatic purge on start and configure crawlee to store the worker-specific data
+// in a separate directory (needs to be done AFTER the queue is initialized when running locally) (step 2)
 const config = new Configuration({
+    purgeOnStart: false,
     storageClientOptions: {
         localDataDirectory: `./storage/worker-${process.env.WORKER_INDEX}`,
     },

packages/core/src/configuration.ts

@@ -31,7 +31,7 @@ export const coerceBoolean = z.preprocess((val) => {
     return val;
 }, z.boolean());
 
-const coerceNumber = z.preprocess((val) => {
+export const coerceNumber = z.preprocess((val) => {
     if (typeof val === 'string') return Number(val);
     return val;
 }, z.number());