Custom integer vertex attributes don't seem to work correctly (is it a bug?)

I'm trying to create a vbo containing integer types and a shader for it but i'm only getting garbage values for the integers. As soon as i'm switching to floats everything works as expected.

I checked every Graphic3d_ShaderAttribute in the Graphic3d_ShaderAttributeList list and the shader code but everything seems fine.

I'm not a opengl pro but unable to detect problems in my code i debugged the opengl part of occt line by line and found OpenGl_VertexBuffer::bindAttribute where glVertexAttribPointer (khronos docs) is used.

If i understand the khronos docs about vertex formats correctly

For integer (both signed and unsigned), you must use glVertexAttribIPointer.

then this might be a bug and would explain what i'm observing.

Am i missing something obvious or should OpenGl_VertexBuffer::bindAttribute handle floats, integers and double precision attributes separately with glVertexAttribPointer, glVertexAttribIPointer and glVertexAttribLPointer respectively?