function isnan( value ) { // explicitly define a function here instead of `@stdlib/math/base/assert/is-nan` in order to avoid circular dependencies
	return ( value !== value );
}
Returns a boolean indicating whether a value is `NaN`.

@private
@param {*} value - input value
@returns {boolean} boolean indicating whether a value is `NaN`

@example
var bool = isnan( NaN );
// returns true

@example
var bool = isnan( 4 );
// returns false