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The #tag magic word does not ignore whitespace when it should. In this example for the <foobar> tag:

{{#tag:foobar
| some data
| param=value
}}

The foobar tag extension will be passed the parameter ' param' (with a leading space character) instead of 'param'.  In other words, in the tag extension code:

function render($input, $argv) {
 ...
}

$argv['param'] will be unset, but $argv[' param'] will be set. This seems wrong.  #tag should ignore the whitespace between the "|" and "param=value".