I’m not even sure if this is the case, but if a government devalues its currency, possibly bond holders get the original value rather than the devalued amount. For example if one bought a $1000 bond at -1% interest and kept it for one year it would be worth $990. However, if during that year, the government devalued their currency by, say, 50% a person who had $1,000 in his wallet would still have the same amount, but it could buy only half as much. Possibly if the bond holder cashed in his bond at the end of the year, he’d get in actual currency, $1,980.
Occam