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Developer Package Guide
Developer Utilities Package
The Developer Utilities Package includes functions that directly access specific internal algorithms and capabilities of Mathematica that are normally used only as part of more general functions.
$MaxMachineInteger maximum integer represented as an atomic data element
MachineIntegerQ whether a number is represented as a machine-size integer
    
BesselSimplify transform Bessel functions in an expression
GammaSimplify transform gamma functions
PolyGammaSimplify transform polygamma functions
ZetaSimplify transform zeta functions
PolyLogSimplify transform polylogarithm functions
TrigToRadicals convert trigonometric functions to radicals in an expression
    
ToPackedArray convert the internal representation of an expression to a packed array
FromPackedArray unpack a packed array
PackedArrayForm print packed arrays in summary form
PackedArrayQ whether an expression is a packed array of an optionally given type
    
Notebook Manipulation
CellInformation information about selected cells in a given notebook object
NotebookConvert convert a notebook from a legacy version of Mathematica
    
PartitionMap apply a function to a list after partitioning the list into sublists
ReplaceAllUnheld apply rules to parts of an expression that would be evaluated
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