Update helpers.ts fix for #134

[pabx06]

fix for #134
JSON.parse(JSON.stringify(item)) have trouble on large object

[relative]

the spread operator won't work here since it only clones the top level keys

[j4k0xb]

maybe the code can be refactored to avoid cloning altogether.
like here it shouldn't make a difference if it uses the original node or a copy:

synchrony/src/transformers/simplify.ts

Lines 225 to 231 in 721cf5d

	ForStatement(node) {
	if (Guard.isBlockStatement(node.body)) return
	sp<BlockStatement>(node.body, {
	type: 'BlockStatement',
	body: [immutate(node.body)],
	})
	},

the only place where it might be necessary is related to control flow functions

[pabx06]

Pretty sure this one is better

-native deep clone:
structuredClone:
https://developer.mozilla.org/en-US/docs/Web/API/structuredClone

[j4k0xb]

based on my tests structuredClone is a fair bit slower than json parse/stringify, but as long as it fixes the issue it shouldn't matter too much
but there are some significantly faster alternatives that could also be used: https://github.com/lukeed/klona/blob/master/src/json.js (benchmark), can even improve the perf by another 25% by not checking for __proto__