I'm trying to do some computations involving bilinears of vector spinors `\psi_a`

and it seems that using `canonicalise`

eliminates terms which shouldn't be zero.

In particular this applies to terms like `\psi^a \bar{\psi^b}`

, as showcased by the following minimal example:

```
# Setup properties needed
{a, b}::Indices.
\psi^a::SelfAntiCommuting.
{\psi^a, \rho, \chi}::Spinor(dimension=10).
{\psi^a, \rho, \chi}::AntiCommuting.
\bar{#}::DiracBar.
A{#}::AntiSymmetric.
```

```
# Non-zero canonicalisation
ex := A_{a b} \bar{\psi^b} \rho \bar{\psi^a} \chi.
canonicalise(_);
```

returns `-A_{a b} \bar{\psi^a} \rho \bar{\psi^b} \chi`

as expected, while

```
# Zero canonicalisation
ex := A_{a b} \bar{\rho} \psi^b\bar{\psi^a} \chi.
canonicalise(_);
```

returns `0`

, even though it should not be zero.

Stripping everything else away, also the following canonicalises to zero, even though it should not:

```
# Zero canonicalisation
ex := A_{a b} \psi^b\bar{\psi^a}.
canonicalise(_);
```

Did I forget something in the setup of my spinors, or is that a genuine error in `canonicalise`

?