[luatex] behavior of string.format

[Reinhard Kotucha]

On 2019-03-10 at 10:10:34 +0100, luigi scarso wrote:

 > On Sun, Mar 10, 2019 at 12:13 AM Reinhard Kotucha <reinhard.kotucha at web.de>
 > wrote:
 > 
 >     Hi,
 >     I just noticed that the TL-2019 version of luatex breaks many of my
 >     scripts.
 > 
 > it's lua5.3  

Yes, I know.  The error message indicates where it comes from.  But I
didn't expect such drastic changes which break many scripts.  Let's
continue the discussion at the bonfire...

Regards,
  Reinhard

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