bibtex bug/feature request

[Karl Berry]

Hi David - indeed, after exporting as indicated from
  https://ui.adsabs.harvard.edu/abs/2017ApJ...848L..12A/abstract

I get the error from bibtex:
  Your field is more than 20000 characters---line 303 of file export-bibtex.bib

with a minimal latex file (using plain.bst).  I assume that's the error
you're seeing also. I'll attach my files for the record.

Unfortunately it looks like the various (semi-)dynamic allocations we
programmed into web2c bibtex didn't catch this particular case; that
20000 appears to be a true compile-time limit :(.

I will increase it and/or make it dynamic for TL'20. If you need a new
binary before that instead of your "and others" workaround, we can
probably make one (to be used manually).

Thanks for the report. --best, karl.

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