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Limits with dictionaries

Suppose I have a dictionary that is the result of a solve command, for example, D={n1:2}

I also have an expression stored, for example, expr1 = 3*n1^2

In this example, I want to find the limit of expr1 as n1 -> 2.

How can I do this given some expression and some dictionary in general? I haven't figured it out with sage_eval yet.

(I know that if it were just substitution, I could use expr1.subs_expr(D) but I have cases where I believe I need to use limits instead of substitution.)