Join-String -FormatString parameter doesn't apply properly #8448
Description
Steps to reproduce
123 | Join-String -FormatString '{0:N2}'Expected behavior
123.00
Actual behavior
123
Environment data
Name Value
---- -----
PSVersion 6.2.0-preview.3
PSEdition Core
GitCommitId 6.2.0-preview.3
OS Microsoft Windows 10.0.17763
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0