fieldImpl in FormTagLib doesn't wipe the attrs after using them

My TagLib is extending FormTagLib, with the next implementation:

def myMethod =

{ attrs, body -> attrs.name = "A" attrs.type = "text" attrs.tagName = "textField" fieldImpl(out, attrs) attrs.name = "B" attrs.type = "text" attrs.tagName = "textField" fieldImpl(out, attrs) }

And the output is the next one:

<input type="text" name="A" id="A" value="" />
<input type="text" name="B" id="A" value="" />

Obviously the Id of the second element should be "B".

the problem is in this function in FormTagLib:

def fieldImpl(out, attrs) {
resolveAttributes(attrs)
attrs.id = attrs.id ?: attrs.name
out << "<input type=\"$

{attrs.remove('type')}

\" "
outputAttributes(attrs, out)
out << "/>"
}

The attrs.id is initialized with whatever comes in the attrs.name (only if attrs.id is empty), so my first call initializes the attrs.id, but in this other function:

void outputAttributes(attrs, writer) {
attrs.remove('tagName') // Just in case one is left
attrs.each

{ k, v -> writer << k writer << '="' writer << v.encodeAsHTML() writer << '" ' }

}

Doesn't remove the attrs (and I think it should do it, isn't it?), maybe something like this:

void outputAttributes(attrs, writer) {
attrs.remove('tagName') // Just in case one is left
attrs.each

{ k, v -> writer << k writer << '="' writer << attrs.remove(k).encodeAsHTML() writer << '" ' }

}