slide/mono — comment on commit 407dd029e3f1ec712a7f6a8b684b8ee8d2a18b61
File: mcs/class/Microsoft.Build.Tasks/Microsoft.Build.Tasks/Copy.cs line 207
By slide:

Sorry, I meant to say I tried both. Running with the v2.0 framework msbuild and putting /tv:2.0, the unconditional clearing of attributes happens if the ReadOnly bit is set same with /tv:2.0 as it does for the 4.0 tools.