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Number error with floats

Nice app! I have a little issue with numbers. Simple additions shows floats limits quickly: 64.38+19.77=84.14999999999 instead of 84.15. It would be more exact using decimal data type.

How to set image size as per widget size?

`
from kivymd.app import MDApp
from kivy.lang import Builder
from kivy.properties import StringProperty
from kivymd.uix.imagelist import SmartTileWithLabel
from random import sample, choice
from string import ascii_lowercase
from kivy.uix.screenmanager import Screen

sample_images = [
"https://cdn.neemo.com.br/uploads/settings_webdelivery/logo/5591/No-Image.jpg",
"https://static.wixstatic.com/media/894d3e_5b35b4311510410fbe9403dc85f46845~mv2.jpg/v1/fill/w_1000,h_563,al_c,q_90,usm_0.66_1.00_0.01/894d3e_5b35b4311510410fbe9403dc85f46845~mv2.jpg",
"https://www.google.com/url?sa=i&url=https%3A%2F%2Fimagensemoldes.com.br%2Fcoragem-o-cao-covarde-vetorizado-03%2F&psig=AOvVaw1cN9wHzJQt8oWrWQJJgTmZ&ust=1647956068777000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCMCG-_Wo1_YCFQAAAAAdAAAAABAP",
    "https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/No_image_available.svg/1024px-No_image_available.svg.png",
]

KV = '''
ScreenRecycleView:
    name: 'recycle_view' 
    viewclass: 'ImageCard'
    RecycleView:
        id: rv
    viewclass: "ImageCard"
    RecycleGridLayout:
        cols: 2
            row_default_height: (self.width - self.cols*self.spacing[0]) / self.cols
            padding: dp(4), dp(4)
            spacing: dp(4)
            size_hint_y: None
            height: self.minimum_height
            default_size_hint: 1, None
            #default_size: None, dp(500) 
'''

class ImageCard(SmartTileWithLabel):
    text = StringProperty()
    source = StringProperty()

class ScreenRecycleView(Screen):
    def on_kv_post(self, base_widget):
        self.ids.rv.data = [
            {
                'text': ''.join(sample(ascii_lowercase, 6)),
                'source': choice(sample_images)
            }
            for x in range(50)
    ]

class MyApp(MDApp):

def build(self):
    root = Builder.load_string(KV)
    return root

MyApp().run()

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