* Keep fractional numbers when saving JSON array subscriptions
toJsonPretty wrote every Double through toInt(), so 0.4 became 0 and
values above Int.MAX_VALUE were clamped. Write whole numbers as Long
and leave other values as Double.
Fixes#6291
* Add a JsonUtil test for numbers in config arrays
* Update JsonUtil.kt
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Co-authored-by: 2dust <31833384+2dust@users.noreply.github.com>
