How do I pass multiple parameters into a function in PowerShell?

Parameters in calls to functions in PowerShell (all versions) are space-separated, not comma separated. Also, the parentheses are entirely unneccessary and will cause a parse error in PowerShell 2.0 (or later) if Set-StrictMode -Version 2 or higher is active. Parenthesised arguments are used in .NET methods only.

function foo($a, $b, $c) {
   "a: $a; b: $b; c: $c"
}

ps> foo 1 2 3
a: 1; b: 2; c: 3

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