convertNumberToDouble incorrectly parses to float in some places (#978)

Author: pjfanning

src/main/java/com/fasterxml/jackson/core/base/ParserBase.java

@@ -1125,13 +1125,13 @@ protected void convertNumberToDouble() throws IOException
 
         if ((_numTypesValid & NR_BIGDECIMAL) != 0) {
             if (_numberString != null) {
-                _numberDouble = _getNumberFloat();
+                _numberDouble = _getNumberDouble();
             } else {
                 _numberDouble = _getBigDecimal().doubleValue();
             }
         } else if ((_numTypesValid & NR_BIGINT) != 0) {
             if (_numberString != null) {
-                _numberDouble = _getNumberFloat();
+                _numberDouble = _getNumberDouble();
             } else {
                 _numberDouble = _getBigInteger().doubleValue();
             }