Just to make a correction to what EvF said, he asserted "0.9r is 1 in decimal" which whilst true, can be seen to imply that 1 isn't already in decimal, which it is.
1 is a representation of the value 1 in decimal.
0.9r is another representation of the value 1 in decimal.
1 is a representation of the value 1 in decimal.
0.9r is another representation of the value 1 in decimal.