ENH: accept utf strings for metadata

[pubpub-zz]

closes #2754

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.85%. Comparing base (454a62a) to head (a8d2155).
Report is 70 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2802      +/-   ##
==========================================
+ Coverage   95.83%   95.85%   +0.01%     
==========================================
  Files          51       51              
  Lines        8544     8579      +35     
  Branches     1692     1696       +4     
==========================================
+ Hits         8188     8223      +35     
  Misses        212      212              
  Partials      144      144              

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[Lucas-C]

Thank you for this fix!

It solved a problem I had when entries in my table of contents (= bookmarks / document outline) contained quotation marks.

Before this PR, using the following Python code, the second heading was not readable in the final document outline:

from pypdf import PdfReader, PdfWriter
from weasyprint import HTML

PDF_NAME = "issue_with_toc_and_quotation_mark.pdf"

HTML(string='''
  <h1>Heading OK</h1>
  <h1>Heading with &nbsp;quotation marks&nbsp;</h1>
''').write_pdf(PDF_NAME)
# -> Document outline iS OK
writer = PdfWriter()
writer.append(PdfReader(PDF_NAME))
writer.write(PDF_NAME)
# -> Document outline iS KO

This bug did not exist with pypdf==4.2.0 but appeared in version 4.3.0