superstruct's dynamic not working

[paolobrasolin]

When writing

fletcher/src/quiver/schema.ts

Line 168 in 2e39476

if (index == 1) return max(Natural, main.length - 2);

I found out about ianstormtaylor/superstruct#830

Since it's already been solved in a pending PR ianstormtaylor/superstruct#966 I'll ust wait for merge.
In the meantime, I imported it as a patch here:

fletcher/src/quiver/schema.ts

Lines 22 to 51 in 2e39476

	//=[ Monkeypatching ]===========================================================
	// source: https://github.com/ianstormtaylor/superstruct/pull/966
	// solves: https://github.com/ianstormtaylor/superstruct/issues/830
	// TODO: remove when PR is merged
	// NOTE: this is needed only by the bounded vertices count int MainItem
	function dynamic<T>(
	fn: (value: unknown, ctx: Context) => Struct<T, any>,
	): Struct<T, null> {
	return new Struct({
	type: "dynamic",
	schema: null,
	*entries(value, ctx) {
	const struct = fn(value, ctx);
	yield* struct.entries(value, ctx);
	},
	validator(value, ctx) {
	const struct = fn(value, ctx);
	return struct.validator(value, ctx);
	},
	coercer(value, ctx) {
	const struct = fn(value, ctx);
	return struct.coercer(value, ctx);
	},
	refiner(value, ctx) {
	const struct = fn(value, ctx);
	return struct.refiner(value, ctx);
	},
	});
	}