Limit on number of schema fields?

[Mike Baranczak]

Is there any significant penalty for having a large number of fields  
in a Solr schema (like between 50 and 100)?

We have a site with several different types of searchable content,  
and each of those types will require several different fields (most  
of which are not shared). I figured that it'd be easier to have  
everything in one index, but I just want to make sure this won't  
cause any problems.

-MB