Replaces comparing .length or .size with .lengthCompare.

Before:

seq.length == n
seq.length != n
seq.length < n
seq.length > n

seq.size == n
seq.size != n
seq.size < n
seq.size > n

After:
seq.lengthCompare(n) == 0
seq.lengthCompare(n) != 0
seq.lengthCompare(n) < 0
seq.lengthCompare(n) > 0

seq.lengthCompare(n) == 0
seq.lengthCompare(n) != 0
seq.lengthCompare(n) < 0
seq.lengthCompare(n) > 0