Pandas `.heatmap()` doesn't respect `show_values()` with matplotlib

[marius-mather]

ALL software version info

From hv.show_versions():

Python              :  3.12.2 | packaged by conda-forge | (main, Feb 16 2024, 20:54:21) [Clang 16.0.6 ]
Operating system    :  macOS-14.4.1-arm64-arm-64bit
Panel comms         :  default

holoviews           :  1.18.3

bokeh               :  3.4.0
colorcet            :  3.1.0
cudf                :  -
dask                :  -
datashader          :  -
geoviews            :  -
hvplot              :  0.9.2
ibis-framework      :  -
IPython             :  8.20.0
jupyter_bokeh       :  -
jupyterlab          :  4.0.11
matplotlib          :  3.8.0
networkx            :  3.1
notebook            :  -
numba               :  -
numpy               :  1.26.4
pandas              :  2.2.1
panel               :  1.4.1
param               :  2.1.0
pillow              :  10.2.0
plotly              :  -
pyarrow             :  14.0.2
pyviz_comms         :  3.0.2
scikit-image        :  -
scipy               :  1.12.0
spatialpandas       :  -
streamz             :  -
tsdownsample        :  -
xarray              :  -

Description of expected behavior and the observed behavior

I am trying to disable the text value annotations on a heatmap when plotting via pandas and matplotlib. hv.help(hv.HeatMap, backend="matplotlib") shows that show_values=False should disable these annotations, but when I use it I get a warning: WARNING:param.main: show_values option not found for heatmap plot with matplotlib; similar options include: [].

Complete, minimal, self-contained example code that reproduces the issue

import holoviews as hv
hv.extension("matplotlib")
import hvplot.pandas

from bokeh.sampledata import sea_surface_temperature as sst

df = sst.sea_surface_temperature

df.hvplot.heatmap(x='time.month', y='time.day', C='temperature',
                  show_values=False,
                  height=500, width=500, colorbar=False)

Screenshots or screencasts of the bug in action

• [x] I may be interested in making a pull request to address this