c4core depends on fast-float [0]. rapidyaml [1] depends on c4core. Moreover, jsonnet [2] depends on rapidyaml. [0] https://github.com/biojppm/c4core/blob/v0.1.9/.gitmodules [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1003397 [2] https://tracker.debian.org/pkg/jsonnet