SR-3126: Decimal(Double.infinity) hangs forever #1567
Merged
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Decimal doesnt fully support floating point so trap when initialised
with Double.infinity.
Also mark Decimal properties .infinity and .signalingNaN and
formTruncatingRemainder(dividingBy:) as unavailable.
Decimal.swift
requires a big sync-up withswift/stdlib/public/SDK/Foundation/Decimal.swift
at some point, but this prevents an infinite-loop and provides a useful error message.