Following code prints 150. It should perhaps error, or force the value between the min and max in some way? (Or if this is as intended perhaps document the behaviour.)
import flet as ft
def main(page):
slider = ft.Slider(min=0, max=100, divisions=100, value=150, label="{value}%")
page.add(
ft.Text("Slider with a custom range and label:"),
slider
)
print(slider.value)
ft.app(target=main)