Make LinExpr.coefficient() always return a Fraction

diff --git a/linpy/linexprs.py b/linpy/linexprs.py
index b2cec53..99ad4ec 100644 (file)
--- a/linpy/linexprs.py
+++ b/linpy/linexprs.py
@@ -122,7 +122,7 @@ class LinExpr:
         """
         if not isinstance(symbol, Symbol):
             raise TypeError('symbol must be a Symbol instance')
-        return self._coefficients.get(symbol, 0)
+        return self._coefficients.get(symbol, Fraction(0))
 
     __getitem__ = coefficient