PS> 0b010000000, 0b10000000, 0b10000000U
128
-128
128
PS> 0b010000000.GetType(), 0b10000000.GetType(), 0b10000000U.GetType()

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     True     Int32                                    System.ValueType
True     True     Int32                                    System.ValueType
True     True     UInt32                                   System.ValueType

Prefixing the literal with a 0 will bypass this and be treated as unsigned.
For example: 0b011111111. This can be necessary when working with literals in the [bigint] range,
as the u and n suffixes cannot be combined.

PS> 0b10000000, 0b010000000
-128
128

PS> 0b1000000, 0b01000000
64
64

PS> [math]::pow(2,63)
9.22337203685478E+18
PS> 0b1000000000000000000000000000000000000000000000000000000000000000
-9223372036854775808
PS> 0b01000000000000000000000000000000000000000000000000000000000000000
ParserError:
Line |
   1 |  0b01000000000000000000000000000000000000000000000000000000000000000
     |                                                                     ~
     | The numeric constant 0b01000000000000000000000000000000000000000000000000000000000000000 is not valid.
PS> 0b1000000000000000000000000000000000000000000000000000000000000000U
9223372036854775808

$i=0
$v='0b1'
while ($i -lt 63)
{
	$i=$i+1
	$v=$v+'0'
	[long]$l = $v
	if ($l -lt 0)
	{
		[pscustomobject]@{str=$v; val=$l}
	}
}

[sbyte]::MaxValue    # 127