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(store_symval_forwarding, find_symbol_value): Likewise.

(store_symval_forwarding, find_symbol_value): Likewise.
(Fmake_variable_buffer_local): Disallow display-local vars here.
(Fmake_local_variable): Likewise.

(Faref, Faset): If object is a string, use XSTRING, not XVECTOR.

(Fnatnump): Use NATNUMP macro.

Fset_default, Fkill_local_variable): Use XBUFFER_LOCAL_VALUE, not XCONS.
(Fmake_variable_buffer_local, Fmake_local_variable): Use the new substructure.

directly.

default_value, Fset_default, Fkill_local_variable): Use the new substructure.
(store_symval_forwarding): Change args to buffer_slot_type_mismatch.

Don't check for Lisp_Void; nothing ever creates that type.

buffer_local_flags as Lisp_Object, not int.

find_symbol_value, Fset, arith_driver, Frem, Fmod, Fash, Flsh): Use new
accessor macros instead of calling XSET directly.

(Flocal_variable_p): New function.
(syms_of_data): defsubr it.

Fstringp, Farrayp, Fsequencep, Fbufferp, Fmarkerp, Fsubrp,
Fbyte_code_function_p, Fchar_or_string_p, Fintegerp, Finteger_or_marker_p,
Fnatnump, Fnumber_or_marker_p, Ffloatp, Fcar, Fcar_safe, Fcdr, Fcdr_safe,
Fsetcar, Fsetcdr, Fboundp, Ffboundp, store_symval_forwarding, Fset,
default_value, Fdefault_boundp, Fdefault_value, Fset_default,
Fmake_variable_buffer_local, Fmake_local_variable, Fkill_local_variable,
indirect_function, Faref, Faset, Farray_length, arithcompare, Fzerop,
Fnumber_to_string, arith_driver, float_arith_driver, Fmod, Fadd1, Fsub1): Use
type test macros.

(Qad_advice_info): Lisp and C names renamed from Qadvice_info.
(Qad_activate): C name renamed from Qactivate_advice.

(Ffset): Activate advice if symbol has advice-info property.

(syms_of_data): Set and gcpro Qwholenump.

(float_arith_driver): min and max yield NaN if any argument is a NaN.