<fileMode> inside a <file> tag is interpreted as decimal, not octal

If I want to use the <fileMode> tag inside a <file> tag I have to resort to decimal numbers. This doesn't happen inside the <fileSet> tags. As example some snipped from a Assembly Descriptor I currently use:

<files>
<file>
<source>target/MDEditor-fat.jar</source>
<fileMode>0493</fileMode><!-- for some silly reason fileMode inside a file tag is interpreted as decimal, not octal. decimal 493 is octal 755-->
</file>
</files>
<fileSets>
<fileSet><!-- shell scripts -->
<directory>deploy/Euro1</directory>
<lineEnding>keep</lineEnding>
<outputDirectory>/</outputDirectory>
<includes>
<include> */.sh </include>
</includes>
<fileMode>0755</fileMode>
</fileSet>
<fileSet><!-- all the other stuff -->
<directory>deploy/Euro1</directory>
<lineEnding>keep</lineEnding>
<outputDirectory>/</outputDirectory>
<excludes>
<exclude> */.sh </exclude>
</excludes>
<fileMode>0644</fileMode>
</fileSet>
</fileSets>