fails:Zlib.adler32 calculates Adler checksum for string
fails:Zlib.adler32 calculates Adler checksum for string and initial Adler value
fails:Zlib.adler32 calculates the Adler checksum for string and initial Adler value for Bignums
fails:Zlib.adler32 assumes that the initial value is given to adler, if adler is omitted
fails:Zlib.adler32 it returns the CRC initial value, if string is omitted
