write.matrix.csr data conversion

write.matrix.csr(mx, y = y, file = file)
table(y)

0       1 
5194394   23487
$ cut -d' ' -f1 f | sort | uniq -c
  23487 2
5194394 1

i.e., 0 is written as 1 and 1 is written as 2.
why?
is there a way to disable this?

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