JsSymbol
JavaScript Symbol
Describes a symbol registered for injection into the JavaScript VM as an intrinsic value; JavaScript symbols consist of a name and an "internal" flag.
The name of a symbol becomes the value's name within an executing VM; the internal flag indicates whether the value should be made available to user code, or merely to internal scripts as a "primordial value."
&nsbp;
Primordial Values
Symbols marked as internal are not guaranteed to be provided to user code, and may carry a prefix which obfuscates their use as public APIs.
Such symbols will return true
from isInternal.