Slow function when parameter is Mandatory its Type is specified #5417
Description
Steps to reproduce
[Byte[]]$Value = [System.IO.File]::ReadAllBytes('C:\Some10MBfile')
# ~1000ms for 10MB array
# ~0.5ms for 1byte array
function MandType {
Param (
[parameter(Mandatory=$True)]
[Byte[]]$Value
)
}
# ~0.3ms for 10MB array
function TypeOnly {
Param (
[parameter()]
[Byte[]]$Value
)
}
# ~0.3 for 10MB array
function MandOnly {
Param (
[parameter(Mandatory=$True)]
$Value
)
}
(Measure-Command { MandType $Value}).TotalMilliseconds
(Measure-Command { MandType ([Byte[]]@(0))}).TotalMilliseconds
(Measure-Command { TypeOnly $Value}).TotalMilliseconds
(Measure-Command { MandOnly $Value}).TotalMilliseconds
Expected behavior
All versions of the above functions should behave identically and complete immediately, regardless of of parameter size as the functions perform no functions.
1.1
1.1
1.1
1.1
Actual behavior
When setting a parameter to Mandatory, specifying its Type, and passing a large array in, the function will pause for some amount of time before starting.
1000
1.1
1.1
1.1
Environment data
PS C:\> $PSVersionTable
Name Value
---- -----
PSVersion 6.0.0-beta.9
PSEdition Core
GitCommitId v6.0.0-beta.9
OS Microsoft Windows 10.0.16299
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
PS C:\> $PSVersionTable
Name Value
---- -----
PSVersion 5.1.16299.19
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.16299.19
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1