Returns 64-bit floating point (double) value for this node, if and only if this node is numeric ( {@link #isNumber} returns true). For othertypes returns 0.0. For integer values, conversion is done using coercion; this may result in overflows with {@link BigInteger} values.
@return 64-bit double value this node contains, if any; 0.0 for non-number nodes.
@since 2.2
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