This package is part of [Img], and refers to the libz support 
library needed by some of the image formats (like [png]). For easier 
handling by the package system, for wrapping, etc. the sources of libz 
were stub-sified and wrapped into a Tcl package, which was given the 
name ''zlibtcl'' to distinguish it from the unmodified libz.

In 8.6, largely superseded by the built-in [zlib] command (and its concomitant C API).

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