Error "Do not know how to serialize a BigInt at JSON.stringify"

[Galienna]

I could not have guessed that would have worked at all. Our support to BigInt is limited to integers: https://github.com/fastify/fast-json-stringify/blob/4d990f660bca9c3b3eb98f086a04c80ade428277/test/bigint.test.js.

Originally posted by @mcollina in #491 (comment)

Hello,
If the serialization of BigInt to integer is supported, I think there's something wrong. I get the error "TypeError: Do not know how to serialize a BigInt at JSON.stringify" running this simple code with fastify 4.2.1:

const fastify = require('fastify');
const server = fastify({
        requestIdHeader: 'x-request-id',
        genReqId: uuidv4,
        ignoreTrailingSlash: true,
        trustProxy: true
    });

server.route({
    method: 'GET',
    url: '/stats',
    handler: function () {
        return [{count: 154n, createdAt: '2022-01-01'}]
    },
    schema: {
        $id: 'get-stats',
        response: {
            200: {
                type: 'array',
                items: {
                    count: {
                        type: 'integer',
                        minimum: 0
                    },
                    createdAt: {
                        type: 'string'
                    }
                }
            }
        }
    }
});
server.listen({port: 8080, host: '0.0.0.0'});

Am I doing something wrong ?

[Galienna]

Turns out I'm dumb or exhausted \o/
I was so focused on the serialization error that I missed the bad definition of my item schema.
Sorry...