[Python] How to style size and color of matplotlib suptitle?

This should be straightforward: I want to style the matplotlib suptitle.

Documentation says that fontproperties is a dict of font properties that can be supplied as a parameter.

So:

import matplotlib.pyplot as plt
import matplotlib as mpl

fig, ax = plt.subplots()
ax.set_xlim(0, 1)
fdct = {'color': 'r', 'fontsize': 32}
# Generates error
fig.suptitle('A title', fontproperties=fdct)
# Works
fig.suptitle('A title', fontsize=32)


The first command generates

TypeError: FontProperties.__init__() got an unexpected keyword argument 'color'

But why? I would like to style suptitle with a dict of font properties, like I do for other instances of Text.

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