Sec. 4. Except as otherwise expressly provided, a taxpayer may carry forward any unused tax credit from a prior taxable year to a taxable year that begins after the repeal of the statute that provided the tax credit. However, any limits on:
(1) the amount carried forward; or
(2) the number of years to which an unused tax credit may be carried forward;
apply to any part of a tax credit carried forward under this section as if the statute allowing the unused tax credit to be carried forward had not been repealed.