There are some days where we can find ourself really stupid... I mean really! This is what happen to me when I recieve a mail from Hartmut Schirmacher, demonstrating with a GLSL specification quote that both operators == and != are supported in GLSL for all data types.
I recieved many times requests for these operators in GLM and I always replied that it isn't supported by default in GLM as it isn't supported either by GLSL so we should instead use all(equal(v1, v2)) or an available GLM extension. This is clearly not true now and I am now living the rest of my life with an unforgiving shame...
This mistake is now fixed in GLM 0.9.0.7.