Why does Anaconda leave 100GB empty for LVM Thin ?

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Hi,

I have just installed a new Fedora 33 KDE system. 

So this is my layout:


NAME                                          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                                             8:0    0 931.5G  0 disk   
├─sda1                                          8:1    0   512M  0 part  /boot/efi
├─sda2                                          8:2    0     1G  0 part  /boot
└─sda3                                          8:3    0   930G  0 part   
 └─luks-aee439f3-528c-4481-ab09-622304e727bc 253:0    0   930G  0 crypt  
   ├─vgfedora-pool00_tmeta                   253:1    0   424M  0 lvm    
   │ └─vgfedora-pool00-tpool                 253:3    0 829.2G  0 lvm    
   │   ├─vgfedora-fedora                     253:4    0 829.2G  0 lvm   /
   │   └─vgfedora-pool00                     253:5    0 829.2G  1 lvm    
   └─vgfedora-pool00_tdata                   253:2    0 829.2G  0 lvm    
     └─vgfedora-pool00-tpool                 253:3    0 829.2G  0 lvm    
       ├─vgfedora-fedora                     253:4    0 829.2G  0 lvm   /
       └─vgfedora-pool00                     253:5    0 829.2G  1 lvm   

The same thing as above in pastebin: 
https://pastebin.com/raw/xwXngMRh

If you notice that /dev/sda3 is of size 930G, but the volume group is only 829.2 G.

Why is that ? I have selected the size of the volume group as "Large as possible", but still 100G is left out.

Is this some kind of recommended setting for thin-LVMs ?

I am selecting Thin-LVM with LUKS2 during the install.

Can someone help me understand why this is happening and how I can fix it ? 

Will making a custom kickstart help here ?

--
Regards,
Sreyan Chakravarty
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