= Hi,

I uploaded a new ve= rsion with some new features discussed at the end of this mail.

- A= next version of luatex will break context (format making etc) but the chan= ge is unavoidable because of other macro package demands wrt security (cont= ext does that differently). The low level start up command
has been ada= pted so unless you update indepdently thinsg should work ok. =C2=A0Of cours= e this has no consequences for lmtx.

- I've done a bit of callback = cleanup (like getting rid of some mkiv luatex left-overs). It should have n= o effect on regular usage.

- There again a few improvements wrt mat= h (this time dealing with accents artifacts in some fonts). We check all th= e free math fonts for potential issues and then try to fix it (read: deal w= ith it). It's a lot of work but we're getting there.

-=C2=A0A=C2=A0few=C2=A0reported=C2=A0buglets=C2=A0hav= e=C2=A0been=C2=A0fixed.

- The biggest addition is however a = new number model. In metapost one can now use 'posit' (positfun instance) a= s number mode which will use (currently 32 bit but at some point 64 bit) po= sit unums. It's also bit of a playground because 32 bit posits are not more= accurate than 64 bit doubles. It anyhow exposed some potential issues that= we'll look into.

- There's also a (again currently 32 bit) posit l= ibrary at the Lua end as playground.

- However, 32 bit posits come = in handy at the tex end because they pack better accuracy in 32 bits than f= loats and it makes it possible to have native floats, so we have:

\newfloat=C2=A0=C2=A0(uses=C2=A0\floatde= f,=C2=A0register=C2=A0like=C2=A0\dimendef=C2=A0is=C2=A0used=C2=A0in=C2=A0\n= ewdimen)

\newposit=C2=A0= =C2=A0(uses=C2=A0\positdef,=C2=A0like=C2=A0\dimensiondef=C2=A0etc)
\floatexpr=C2=A0(like=C2=A0\nume= xpr)

\iffloat=C2=A0=C2= =A0=C2=A0(like=C2=A0\ifnum)=C2=A0(also=C2=A0\ifabsfloat=C2=A0and=C2=A0i'll= =C2=A0add=C2=A0the=C2=A0others=C2=A0too)

Actually it adds an= extra range of registers so it bumps memory usage a bit. I'm considering l= owering the number of registers (currently 64K per category) because after = all, if 64K is not enough then we can as well stick to 32K or 16K (for some= even less). There's always Lua for unlimited storage of quantities.
So,

\newfloat\fooA

\scratchdimen=3D123.456pt\r= elax =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[\type{dim:} \the\scratchdim= en=3D=3D123.456pt]\par
\fooA =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =3D123.456\relax =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[\ty= pe{pos:} \the\fooA =3D=3D123.456] =C2=A0\par
\fooA =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=3D\scratchdimen\relax =C2=A0=C2=A0=C2=A0[\type{pos= :} \the\fooA =3D=3D123.456] =C2=A0\par
\scratchdimen=3D\fooA\relax =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0[\type{dim:}= \the\scratchdimen=3D=3D123.456pt]\par
\scratchdimen\dimexpr\fooA+10pt\= relax[\type{dim:} \the\scratchdimen=3D=3D133.456pt]\par

produces
[dim:=C2=A0123.456pt=3D=3D123.456= pt]
[pos:=C2=A0123.456001281= 73828=3D=3D123.456]
[pos:=C2= =A0123.45599365234375=3D=3D123.456]
[dim:=C2=A0123.456pt=3D=3D123.456pt]
[dim:=C2=A0133.456pt=3D=3D133.456pt]

As you= can see dimens will get mapped onto floats not as integers (scaled points)= but in pt units. Counts stay numbers. I need to handle glue too (not yet d= one).

In the future I might use this for fractions but there might = be some rough ends so for now it's experimental.

Hans

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