Support empty slice copy.

an argument of IntSlice, UintSlice, FloatSlice and StringSlice changed.

Add IntSlice, UintSlice, FloatSlice, StringSlice / Change format of f…

…loat to string.

Fix that option does not pass in the case of Slice, Map, Array.

fix: nested embeded struct with pointer

add Options

FIX: when output has uninitialized embeded field.

Add MapWithDepth, fix bugs

remove debug print