Re: [w3ctag/design-reviews] Temporal proposal (#311)

Re: DOMHighResTimeStamp/DOMTimeStamp

Both of these are defined as floating point values representing milliseconds. That in turn means that while the resolution may be sufficient, the precision may be off.

Again we have opted to be more explicit.

 * `Instant.prototype.seconds` - the number seconds since epoch
 * `Instant.prototype.milliseconds` - the number milliseconds since epoch
 * `Instant.prototype.microseconds` - the bigint microseconds since epoch
 * `Instant.prototype.nanoseconds` - the bigint nanoseconds since epoch

Being explicit and using `BigInt` where relevant ensures that we have both resolution and precision to be correct for calculations.

Using

 * `Instant.fromSeconds(seconds : number)`
 * `Instant.fromMilliseconds(milliseconds : number)`
 * `Instant.fromMicroseconds(microseconds : bigint)`
 * `Instant.fromNanoseconds(nanoseconds : bigint)`

allows for interoperation.

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