[metapost] luamplib fails to process string with "char 0"

[Hans Hagen]

On 7/29/2021 5:36 PM, Hans Hagen wrote:

> btw, internally the zero is there (as length)AB) shows, so in principle 
> we can pass the length but that doesn't guarantee that it will fail 
> upstream (i'll look into the mp part but won't touch the rest)
we have a patch for the lib but it first has to go through qa and then 
might end up in experimental for a while to catch possible side effects

Hans

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