in src/js/modules/belt.js [163:173]
export function merge(to, from) {
for (const n in from) {
if (typeof to[n] != 'object') {
to[n] = from[n];
} else if (typeof from[n] == 'object') {
to[n] = merge(to[n], from[n]);
}
}
return to;
};