MCMCglmm - metric of the estimates

Hi,

my question is probably amateurish but I can't seem to find the answer
anywhere.

In what metric are the MCMCglmm package's posterior means for family =
"categorical"?

I suppose that they can't be odds ratios and probabilites as my numbers are
outside their bounds. So I'm thinking ? are they just basic regression
coefficients conceptually equal to those obtained by lme4::glmer?

Thank you!