jQuery Object doesn't support property or method trim() in IE

What's up with the jQuery trim method??

jQuery('#Reminders').attr('value').trim()

Object doesn't support property or method 'trim'

jQuery('#Reminders').attr('value')

"5,1,1"

$('#Reminders').attr('value').split(',')

[5,1,1]
[0]: "5"
[1]: "1"
[2]: "1"

I don't have these woes in FireFox or Chrome ... only IE 9.0. Is there something special about trim() ... I didn't get the memo .