Option to automatically use sequens, sequentis in postnote

[ghost]

Biblatex currently has an option to compress ranges of pages in backrefs to use the sequens and sequentis strings where appropriate. An option to do the same for postnotes in citations seems to make sense.

E.g. \autocite[34, 35]{Chomsky1957} would produce Chomsky (1957, pp. 34 sq.)

[moewew]

Idea courtesy of Ulrike Fischer at https://golatex.de/viewtopic,p,108275.html#108275

\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage{csquotes}
\usepackage[style=authortitle, backend=biber]{biblatex}
\DeclareFieldFormat{postnote}{\mkpageprefix[pagination][\mkcomprange]{#1}}

\makeatletter
\def\blx@comprange@end{%
  \numdef\blx@tempb\blx@tempb
  \ifnum\blx@tempe>\c@maxcomprange\relax
    \numdef\blx@tempc\blx@tempc
  \else
    \numdef\blx@tempc\blx@tempd
  \fi
  \begingroup
  \edef\blx@tempb{\endgroup
    \blx@range@out@value{%
      \expandonce\blx@range@out@item@process{\blx@tempb}%
       \psq%\noexpand\bibrangedash
      %\expandonce\blx@range@out@item@process{\blx@tempc}
        }}%
  \blx@tempb
  }

\addbibresource{biblatex-examples.bib}

\begin{document}
Test.\footcite[380]{sigfridsson}

Test.\footcite[380-381]{sigfridsson}

Test.\footcite[380\psq]{sigfridsson}

\printbibliography
\end{document}