property Temporal.DifferenceOptions.roundingMode
Controls how rounding is performed:
- `halfExpand`: Round to the nearest of the values allowed by
`roundingIncrement` and `smallestUnit`. When there is a tie, round away
from zero like `ceil` for positive durations and like `floor` for
negative durations.
- `ceil`: Always round up, towards the end of time.
- `trunc`: Always round down, towards the beginning of time. This mode is
the default.
- `floor`: Also round down, towards the beginning of time. This mode acts
the same as `trunc`, but it's included for consistency with
`Temporal.Duration.round()` where negative values are allowed and
`trunc` rounds towards zero, unlike `floor` which rounds towards
negative infinity which is usually unexpected. For this reason, `trunc`
is recommended for most use cases.