Templating: negative numbers to the power of a variable are calculated incorrectly.

[Troon]

The problem

Writing IEEE 754 macro, reference equation uses -1**(sign_bit). I kept getting incorrect results. On investigation, I found:

{% set z = 0 %}
{{ -1**0 }}  # returns 1, correctly
{{ -1**z }}  # returns -1, incorrectly

Further checks show this appears to affect all negative numbers:

{% set z = 4 %}
{{ (-2)**4 }}  # 16
{{ (-2)**z }}  # -16

Worked around my original problem with [1,-1][sign_bit].

What version of Home Assistant Core has the issue?

2023.7.1

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant Container

Integration causing the issue

Template

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[krepysh]

Also this issue has an opened PR which fixes order. pallets/jinja#1723

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