bug: nanoseconds

[SgtPooki]

Nanoseconds are calculated incorrectly. See https://github.com/ipfs/helia-verified-fetch/pull/19#discussion_r1530216696 for more details. Basically,

Some proofs (copy and paste into dev console):

• nanoseconds are 1e9, or "One billionth of one second".
  • BigInt(1)/*<s>*/ * BigInt(1e9)/*<ns>*/ === (1000000000n)/*<ns>*/ /* 1,000,000,000/*<ns>*/
  • 1000000000/*<ns>*/ * 1e-9/*<ns-to-s>*/ === 1
• milliseconds are "1e6" or "One millionth of one second"
  • BigInt(1)/*<s>*/ * BigInt(1e6)/*<ms>*/ === 1000000n/*<ms>*/ /* === 1,000,000/*<ms>*/
  • 1000000/*<ms>*/ * 1e-6/*<ms-to-s>*/ === 1
• nanoseconds are 1e6 or "One millionth of one millisecond"
  • BigInt(1)/*<ms>*/ * BigInt(1e6)/*<ns>*/ === 1000000n/*<ns>*/ /* === 1,000,000/*<ms>*/
  • 1000000/*<ns>*/ * 1e-6/*<ns-to-ms>*/ === 1

https://github.com/ipfs/js-ipns/blob/16e0e10682fa9a663e0bb493a44d3e99a5200944/src/index.ts#L171 creates lifeTimeNs as:

function lifeTimeNs(ms, ns) {
    // BigInt(100000) === BigInt(1e5)
    return (BigInt(ms) * BigInt(100000)) + BigInt(ns ?? '0')
}
// should match BigInt(1)/*<ms>*/ * BigInt(1e6)/*<ns>*/ === 1000000n/*<ns>*/
lifeTimeNs(1) === BigInt(1e6) // false, 
// returns `100000n` instead of `1000000n`

references:

• https://en.wikipedia.org/wiki/Orders_of_magnitude_(time)#Less_than_one_second

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