Criminalizing being poor? How's that for an "American value"?

From AP -

Record numbers in the US are homeless. Can cities fine them for sleeping in parks and on sidewalks?

The most significant case in decades on homelessness has reached the Supreme Court as record numbers of people in America are without a permanent place to live.

The justices on Monday will consider a challenge to rulings from a California-based appeals court that found punishing people for sleeping outside when shelter space is lacking amounts to unconstitutional cruel and unusual punishment.

When the U.S. Supreme Court sides with fining poor people for being poor (and they almost certainly will  do so), how long will it be before someone proposes the use of prisons for people who can't afford to pay the fines imposed for being poor?