$locale / $currency body params transformed to __locale / __currency in POST request body

[sebastian-meckovski]

When sending $locale and $currency as body parameters in a POST request, Swell appears to transform $-prefixed keys to __-prefixed keys before they reach the handler.

My function example:

export const config: SwellConfig = {
  description: 'Public endpoint to query products using full backend API operators',
  route: {
    methods: ['post'],
    public: true,
  },
};

export async function post(req: SwellRequest) {
  console.log('Querying products with params:', req.body);
  const raw = req.body ?? {};

  const results = await req.swell.get('/products', params);
  return results;
}

The incoming request body looks like this:

POST /query-products
Querying products with params:
{
  "limit": 6,
  "page": 1,
  "where": {
    "active": true
  },
  "fields": "name,price,images,slug",
  "__locale": "lt",
  "__currency": "EUR"
}

I added a workaround to manually convert it back to $

  const params = Object.fromEntries(
    Object.entries(raw).map(([key, value]) => [
      key.startsWith('__') ? `$${key.slice(2)}` : key,
      value,
    ])
  );

It's not critical but I'm guessing this is not intentional?