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Description
$ printf "%a\n" 255
0xf.fp+4
$ ./target/debug/coreutils printf "%a\n" 255
printf: %a: invalid conversion specification
Here is the description of the floating-point conversions: https://www.gnu.org/software/libc/manual/html_node/Floating_002dPoint-Conversions.html
This seems to be called CninetyNineHexFloatf in the code:
coreutils/src/uu/printf/src/tokenize/sub.rs
Line 163 in ca705e5