Allow kotlin empty collections that don't allocate #41
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These are already implemented using singletons and idiomatically
listOf
etc are interchangeable withemptyList
listOf
directly callsemptyList
mapOf
directly callsemptyMap
setOf
directly callsemptySet
sequenceOf
does returnemptySequence
from the no param call, but I'm not sure if it creates some array for thevarargs
.I'm not familiar with
arrayOf