KTIJ-20639 "Remove explicit type" breaks code for Long variables

[t-kameyama]

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https://youtrack.jetbrains.com/issue/KTIJ-20639

[zarechenskiy]

I believe this issue is also true for other numeric types. For example:

val long: Long = 0 // 0 -> 0L
val uLong: ULong = 0u // 0u -> 0uL; 0U -> 0UL
val byte: Byte = 0 // 0 -> 0.toByte()
val short: Short = 0 // 0 -> 0.toShort()

Could you please support these cases as well?

[zarechenskiy]

Also, while we're on this issue, please consider case when we have null on RHS:

val long: Long? = null

We could insert cast in this case:

val long = null as Long?

[t-kameyama]

Fixed