[Tex/LaTex] Problem with enumerate

Question

I am using enumerate (with the package enumitem) and want to make lists as in the example below.

Here is the first list: 
     1. Item 1.
     2. Item 2.
etc. 

Here is the second list: 
    (i) Item 1.
   (ii) Item 2.
  (iii) Item 3. This item is longer, to show how text should be aligned when it
        wraps after the end of a line. 

Here is an MWE. Setting labelindent gives the desired text wrap, but the items won't be aligned. Setting itemindent aligns the items, but messes up the text wrap.

\documentclass{article}
\usepackage{enumitem}

\begin{document}

\noindent First the result by setting ``labelindent". Here is the first list: 
\begin{enumerate}[leftmargin=*, labelsep=1.0em, labelindent=\parindent, 
itemsep=0.0em, topsep=0.5em, label=\arabic*.]
    \item Item 1.
    \item Item 2.
\end{enumerate}
Here is the second list: 
\begin{enumerate}[leftmargin=*, labelsep=1.0em, labelindent=\parindent, 
itemsep=0.0em, topsep=0.5em, label=(\roman*)]
    \item Item 1.
    \item Item 2. 
    \item Item 3. This item is longer, to show how text should be aligned when it 
    wraps after the end of a line. 
\end{enumerate}
Notice how the items in the two lists are not the same distance from the left 
margin. 

Now the solution with by setting ``itemindent". Here is the first list: 
\begin{enumerate}[labelsep=1.0em, itemindent=\parindent, itemsep=0.0em, 
topsep=0.5em]
    \item Item 1.
    \item Item 2.
\end{enumerate}
Here is the second list: 
\begin{enumerate}[labelsep=1.0em, itemindent=\parindent, itemsep=0.0em, 
topsep=0.5em, label=(\roman*)]
    \item Item 1.
    \item Item 2. 
    \item Item 3. This item is longer, to show how text should be aligned when it 
    wraps after the end of a line. 
\end{enumerate}
Notice how the text in the various items is the same distance from the left margin, except 
in the last line of the    last item. 

\end{document}

Answer 1

In my opinion, the usage of widest*=somenumber should be better, together with a special list clone.

\documentclass{article}
\usepackage{enumitem}

\begin{document}
\def\widestnumber{25}

\newlist{mylist}{enumerate}{1}
\setlist[mylist,1]{   
  leftmargin=40pt,
  labelsep=1.0em, %labelindent=\parindent, 
  itemsep=0.0em, 
  topsep=0.5em, 
  label=\arabic*.,
  widest*=\widestnumber}


\noindent First the result by setting "labelindent". Here is the first list: 
\begin{mylist}
    \item Item 1.
    \item Item 2.
\end{mylist}
Here is the second list: 
\begin{mylist}[label=(\roman*)]
    \item Item 1.
    \item Item 2. 
    \item Item 3. This item is longer, to show how text should be aligned when it 
    wraps after the end of a line. 
\end{mylist}
Notice how the items in the two lists are not the same distance from the left 
margin. 
\end{document}