[luatex] behavior of string.format

[Reinhard Kotucha]

Hi,
I just noticed that the TL-2019 version of luatex breaks many of my
scripts.

In the past

  string.format('%d', math.pi)

returned the integer part of math.pi but the latest release crashes
with an error message:

  bad argument #2 to 'format' (number has no integer representation)

Regards,
  Reinhard

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Reinhard Kotucha                            Phone: +49-511-3373112
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