Inconsistent values when setting FloatSlider through code multiple times

[zyzzyxdonta]

Description

When setting and getting a slider's value multiple times, the values are inconsistent.

inconsistency.webm

Reproduce

FloatSlider.ipynb.txt

1. Create a new environment and install jupyter and ipywidgets: python -m venv .; source bin/activate; python -m pip install jupyter ipywidgets
2. Run Jupyter notebook attached to this bug report: jupyter notebook Floatslider.ipynb. Evaluate all cells.
3. Click button to change the widget value to 0.7000001. Print the value of the slider: It shows 0.7.
4. Click button again. Print the value again. This time it shows 0.7000001 as expected.

Expected behavior

The widget holds the same value every time.

Context

• ipywidgets version 8.1.5
• Operating System and version: Fedora Linux 40 (KDE Plasma)
• Browser and version: Firefox 130.0

Troubleshoot Output

$PATH:
        /tmp/tmp.iTKG16rSSR/bin
        /home/me/.local/bin
        /usr/local/bin
        /usr/bin
        /bin
        /usr/local/sbin
        /usr/sbin
        /sbin
sys.path:

/tmp/tmp.iTKG16rSSR/bin

/usr/lib64/python312.zip

/usr/lib64/python3.12

/usr/lib64/python3.12/lib-dynload

/tmp/tmp.iTKG16rSSR/lib64/python3.12/site-packages

/tmp/tmp.iTKG16rSSR/lib/python3.12/site-packages
sys.executable:

/tmp/tmp.iTKG16rSSR/bin/python
sys.version:

3.12.5 (main, Aug 23 2024, 00:00:00) [GCC 14.2.1 20240801 (Red Hat 14.2.1-1)]
platform.platform():

Linux-6.10.9-200.fc40.x86_64-x86_64-with-glibc2.39
which -a jupyter:

/tmp/tmp.iTKG16rSSR/bin/jupyter

/usr/bin/jupyter

/bin/jupyter
pip list:

Package                   Version

------------------------- --------------

anyio                     4.4.0

argon2-cffi               23.1.0

argon2-cffi-bindings      21.2.0

arrow                     1.3.0

asttokens                 2.4.1

async-lru                 2.0.4

attrs                     24.2.0

babel                     2.16.0

beautifulsoup4            4.12.3

bleach                    6.1.0

certifi                   2024.8.30

cffi                      1.17.1

charset-normalizer        3.3.2

comm                      0.2.2

debugpy                   1.8.5

decorator                 5.1.1

defusedxml                0.7.1

executing                 2.1.0

fastjsonschema            2.20.0

fqdn                      1.5.1

h11                       0.14.0

httpcore                  1.0.5

httpx                     0.27.2

idna                      3.10

ipykernel                 6.29.5

ipython                   8.27.0

ipywidgets                8.1.5

isoduration               20.11.0

jedi                      0.19.1

Jinja2                    3.1.4

json5                     0.9.25

jsonpointer               3.0.0

jsonschema                4.23.0

jsonschema-specifications 2023.12.1

jupyter                   1.1.1

jupyter_client            8.6.3

jupyter-console           6.6.3

jupyter_core              5.7.2

jupyter-events            0.10.0

jupyter-lsp               2.2.5

jupyter_server            2.14.2

jupyter_server_terminals  0.5.3

jupyterlab                4.2.5

jupyterlab_pygments       0.3.0

jupyterlab_server         2.27.3

jupyterlab_widgets        3.0.13

MarkupSafe                2.1.5

matplotlib-inline         0.1.7

mistune                   3.0.2

nbclient                  0.10.0

nbconvert                 7.16.4

nbformat                  5.10.4

nest-asyncio              1.6.0

notebook                  7.2.2

notebook_shim             0.2.4

overrides                 7.7.0

packaging                 24.1

pandocfilters             1.5.1

parso                     0.8.4

pexpect                   4.9.0

pip                       23.3.2

platformdirs              4.3.6

prometheus_client         0.20.0

prompt_toolkit            3.0.47

psutil                    6.0.0

ptyprocess                0.7.0

pure_eval                 0.2.3

pycparser                 2.22

Pygments                  2.18.0

python-dateutil           2.9.0.post0

python-json-logger        2.0.7

PyYAML                    6.0.2

pyzmq                     26.2.0

referencing               0.35.1

requests                  2.32.3

rfc3339-validator         0.1.4

rfc3986-validator         0.1.1

rpds-py                   0.20.0

Send2Trash                1.8.3

setuptools                75.1.0

six                       1.16.0

sniffio                   1.3.1

soupsieve                 2.6

stack-data                0.6.3

terminado                 0.18.1

tinycss2                  1.3.0

tornado                   6.4.1

traitlets                 5.14.3

types-python-dateutil     2.9.0.20240906

uri-template              1.3.0

urllib3                   2.2.3

wcwidth                   0.2.13

webcolors                 24.8.0

webencodings              0.5.1

websocket-client          1.8.0

widgetsnbextension        4.0.13

Command Line Output

Nothing interesting

Browser Output

Nothing interesting