lfpinit() signed or unsigned?

[Hal Murray]

esr at thyrsus.com said:
>> How about something like l_fp_time (unsigned) and
>> l_fp_delta or _fp_offset (signed)?
> More detail, please? 

Replace
  typedef uint64_t l_fp;
with
  typedef uint64_t l_fp_time;
  typedef int64_t l_fp_offset;

Then replace all the places that used to use l_fp with the correct one.

Then iterate on making macros and removing casts in the main code.


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