Runaway argument using int() function in pgfplots

Question

The MWE below yields

Runaway argument?
3\pgfflt@EOI \ifpgfmathfloatparsenumberpendingperiod \pgfmathfloat@a@Mtok \ETC.
./TeX-SE.tex:29: Paragraph ended before \pgfflt@readlowlevelfloat was complete.
<to be read again> 
                   \par 

when I attempt to use the int() function as documented in the pgf manual:

Notes:

• The floor plot is added just to show that the syntax is correct. So, commuting out the second \addplot produces an output.

Code:

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
    axis lines=middle
]
%% This works
\addplot [
    jump mark mid,
    domain=-3:3,
    samples=100,
    very thick, red
] {floor(x)};
%%% This now no work.
\addplot [
    jump mark mid,
    domain=-3:3,
    samples=100,
    very thick, red
] {int(x)};
\end{axis}
\end{tikzpicture}
\end{document}

Answer 1

In case anyone else comes across this bug I am posting my workaround, until the bug is fixed. I defined

MyInt(\x)=x-mod(\x,1)

which yields:

Notes

• MyInt() produces results identical to the current broken floor() function. Corrected version is defined as Floor() in the MWE as per How to Graph Floor/Ceiling Functions in LaTeX (PGFPlots).

Code:

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\tikzset{
    declare function={Floor(\x)=round(\x-0.5);},% floor() is broken.
    declare function={MyInt(\x)=x-mod(\x,1);},
}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
    xmin=-3.2, xmax=3.2,
    ymin=-2.2, ymax=2.2,
    axis lines=middle
]
\addplot [
    jump mark mid,
    domain=-3:3,
    samples=100,
    very thick, red
] {MyInt(x)};
\end{axis}
\end{tikzpicture}
\end{document}