Package Manifest 2 - <depend> attribute version does not work

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I am currently looking into versioning my catkin packages and making sure that I am using the correct versions. I am using Package Manifest Version 2 and according to REP-140, I should be able to specify the versions of my dependencies.

E.g. I have a package A (version 1.1) and a package B that depends on package A. I now would like to make sure, that version 1.1 of package A is used when building package B. My package.xml's will contain the following (for the sake of simplicity, I only include the relevant parts):

package A package.xml

<?xml version="1.0"?>
  <package format='2'>
  <name>A</name>
  <version>1.1.0</version>
  ...
</package>

package B package.xml

<?xml version="1.0"?>
  <package format='2'>
  <name>B</name>
  <version>1.0.0</version>
  <depend version_eq="1.1.0">A</depend>
  ...
</package>

So far so good, everything compiles fine. However, if I change that depend tag in package B package.xml above, e.g. to

<depend version_eq="2.0.0">A</depend>

..it still compiles fine! Meaning that it just does not care about the version attribute.

What am I doing wrong?

Edit: I just noticed that a warning is printed:

catkin_package() version mismatch: the package.xml of 'B' build_depends on 'A = 1.0.0', but 'A 0.9.0' found

Is this the expected behaviour or should the build fail?