inconsistent local/global assignment

[u-fischer]

This here

\RequirePackage[check-declarations,enable-debug]{expl3}
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{tikzmark}
\begin{document}
\tikzmark{blub}abc
\end{document}

errors with

! LaTeX3 Error: Inconsistent local/global assignment

For immediate help type H <return>.
 ...                                              

l.506 \bool_set_true:N \g__sn_preamble_bool

? h

This is a coding error.

Local assignment to a global variable '\g__sn_preamble_bool'.

? x

as the library doesn't use \bool_gset when initializing the boolean:

\bool_new:N \g__sn_preamble_bool
\bool_set_true:N \g__sn_preamble_bool

[loopspace]

Bother. I thought I'd caught all of those. Thanks for finding it.

[loopspace]

Fixed in c2624af