Display square brackets in the output macro definition

Question

I am using cite package to manage citations (compressing many citations, superscripting). And I am trying to use the package's \citen command to display the in-line version of a reference, but within square brackets (in the answer to @Steven B. Segletes's "self-referential-ness": so as not to have to put square brackets all the time when I need them).

I came to this (as suggested by @Steven B. Segletes and @TeXnician I removed mathmode):

\newcommand{\citin}[1]{%
    [\citen{#1}]%
}%

Although I get no errors nor warnings and the output looks nice, I would like to know if this is the proper way to define square brackets within macro, if else, please tell, I am new in macro definitions. I also worry if those brackets will keep together with the number inside on line break.

Is this also the way I should follow to get square bracketed superscripted output?

EDIT: MWE

\documentclass[11pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage{blindtext}
\usepackage[super,nobreak]{cite}% cytowania w indeksie górnym, bez łamania wyliczeń cytowanych
\newcommand{\citin}[1]{% użyj \citin do cytowania w linii (np. Wg [1] sprawa ma się tak...)
    [\citen{#1}]%
    }%
\begin{document}%
\blindtext \cite{przyklad} \par
Or maybe not all from \citin{kowalski}.

\begin{thebibliography}{9}

\bibitem{przyklad}
D. Przyklad.
\newblock Title 1.
\newblock {\em APL}, 1:1–2, 2015.

\bibitem{kowalski}
D. Kowalski.
\newblock Title 2.
\newblock {\em JPC}, 2:2–5, 2017.
\end{thebibliography}
\end{document}

Answer 1

To answer the direct question, maybe this?

\documentclass[11pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage{blindtext,amsmath}
\usepackage[super,nobreak]{cite}% cytowania w indeksie górnym, bez łamania wyliczeń cytowanych
\newcommand{\citin}[1]{% użyj \citin do cytowania w linii (np. Wg [1] sprawa ma się tak...)
    \unskip$^\text{[\citen{#1}]}$%
    }%
\begin{document}%
\blindtext \cite{przyklad} \par
Or maybe not all from \citin{kowalski}.
Also from \citin{przyklad, kowalski}.

\begin{thebibliography}{9}

\bibitem{przyklad}
D. Przyklad.
\newblock Title 1.
\newblock {\em APL}, 1:1–2, 2015.

\bibitem{kowalski}
D. Kowalski.
\newblock Title 2.
\newblock {\em JPC}, 2:2–5, 2017.
\end{thebibliography}
\end{document}

---

However, the cite manual gives the explicit example of how to make \cite place superscripted citations in brackets, if this would be preferable.

\documentclass[11pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage{blindtext,amsmath}
\usepackage[super,nospace,compress,nobreak]{cite}% cytowania w indeksie górnym, bez łamania wyliczeń cytowanych
\makeatletter
\renewcommand\@citess[1]{\textsuperscript{[#1]}}
\makeatother
\begin{document}%
\blindtext \cite{przyklad} \par
Or maybe not all from \cite{kowalski}.
Also from \cite{przyklad, kowalski}.

\begin{thebibliography}{9}

\bibitem{przyklad}
D. Przyklad.
\newblock Title 1.
\newblock {\em APL}, 1:1–2, 2015.

\bibitem{kowalski}
D. Kowalski.
\newblock Title 2.
\newblock {\em JPC}, 2:2–5, 2017.
\end{thebibliography}
\end{document}