Re: performing update(s)
New to conTeXt, have not performed a specific update prior to this.
My conTeXt installation is part of TeXlive-2023 (under Linux OS). Will
the updates to ConTeXt be handled by tlmgr ?
Thanks,
On 2023-04-26 14:55, Hans Hagen via ntg-context wrote:
> Hi,
>
> I uploaded a new version with some new features discussed at the end of this
> mail.
>
> - A next version of luatex will break context (format making etc) but the
> change is unavoidable because of other macro package demands wrt security
> (context does that differently). The low level start up command
> has been adapted so unless you update indepdently thinsg should work ok. Of
> course 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 no effect on regular usage.
>
> - There again a few improvements wrt math (this time dealing with accents
> artifacts in some fonts). We check all the free math fonts for potential
> issues and then try to fix it (read: deal with it). It's a lot of work but
> we're getting there.
>
> - A few reported buglets have been fixed.
>
> - The biggest addition is however a new number model. In metapost one can now
> use 'posit' (positfun instance) as number mode which will use (currently 32
> bit but at some point 64 bit) posit 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 library 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 floats and it makes it possible to have
> native floats, so we have:
>
> \newfloat (uses \floatdef, register like \dimendef is used in \newdimen)
>
> \newposit (uses \positdef, like \dimensiondef etc)
>
> \floatexpr (like \numexpr)
>
> \iffloat (like \ifnum) (also \ifabsfloat and i'll add the others too)
>
> Actually it adds an extra range of registers so it bumps memory usage a bit.
> I'm considering lowering 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=123.456pt\relax [\type{dim:}
> \the\scratchdimen==123.456pt]\par
> \fooA =123.456\relax [\type{pos:} \the\fooA ==123.456] \par
> \fooA =\scratchdimen\relax [\type{pos:} \the\fooA ==123.456] \par
> \scratchdimen=\fooA\relax [\type{dim:}
> \the\scratchdimen==123.456pt]\par
> \scratchdimen\dimexpr\fooA+10pt\relax[\type{dim:}
> \the\scratchdimen==133.456pt]\par
>
> produces
>
> [dim: 123.456pt==123.456pt]
> [pos: 123.45600128173828==123.456]
> [pos: 123.45599365234375==123.456]
> [dim: 123.456pt==123.456pt]
> [dim: 133.456pt==133.456pt]
>
> 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 done).
>
> In the future I might use this for fractions but there might be some rough
> ends so for now it's experimental.
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl [1] | www.pragma-pod.nl [2]
> -----------------------------------------------------------------
> ___________________________________________________________________________________
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