Serializing with a trailing comma

[snaffi]

Hello Jairus

Thank you for amazing library 🔥

Unfortunatelly I reproduced trailing comma issue .

import {JSON} from "json-as";

@json
export class ItemPluginsBasket {
    @alias("catalog_id")
    catalogId!: string;
    @alias("catalog_item_id")
    catalogItemId!: string;
    @alias("outlet_id")
    outletId!: string;
}

@json
export class ItemPlugins {
    @omitnull()
    basket!: ItemPluginsBasket | null;
}

@json
export class Item {
    id!: string;
    @omitnull()
    plugins!: ItemPlugins | null;
}

export function example(): void {
    const s: Item = {
        id: "1",
        plugins: {
            basket: {
                catalogId: "1",
                catalogItemId: "2",
                outletId: "3"
            }
        }
    };
    const outputStr = JSON.stringify<Item>(s);

    console.log(outputStr);
}

Output

{"id":"1","plugins":{"basket":{"catalog_id":"1","catalog_item_id":"2","outlet_id":"3"},}}

If I add some dummy property it produces valid json

@json
export class EmptyObject {
}

@json
export class ItemPlugins {
    @omitnull()
    basket!: ItemPluginsBasket | null;

    dummy!: EmptyObject | null; 
}

Related to #26

[JairusSW]

@snaffl, thanks you! I'll fix this in a moment. Either in the upcoming v1.0 release or a patch release

[JairusSW]

Also sorry I forgot about your previous issue, I didn't mean to close it