destination. This is useful for literal data to be fed to either
strbuf_expand or to the *printf family of functions.
+`strbuf_humanise_bytes`::
+
+ Append the given byte size as a human-readable string (i.e. 12.23 KiB,
+ 3.50 MiB).
+
`strbuf_addf`::
Add a formatted string to the buffer.