function fIr$Tmp return number is
nRes number;
begin        
  nRes :=  268;
  return nRes;
end;

......
function fIr$Tmp_110 return number is 
nRes number;
begin        
  nRes :=  268435456;
  return nRes;
end;
function fIr$Tmp_111 return number is 
nRes number;
begin        
  nRes :=  268;
  return nRes;
end;
function fIr$Tmp_112 return number is 
nRes number;
begin        
  nRes :=  268435457;
  return nRes;
end;
......

alter session set plsql_warnings = 'enable:all';

select count(*) from all_source
 where owner = 'XXXXXXX' 
   and type = 'PACKAGE BODY' 
   and name = 'SVC$23532PKG'
   and text like '%(429514,%'
   --
   130 --  429514 - некорректное значение, возвращаемое fIr$Tmp

select count(*) from all_source
 where owner = 'XXXXXXX' 
   and type = 'PACKAGE BODY' 
   and name = 'SVC$23532PKG'
   and text like '%26843545%'
   --
   3 -- это одна штатная fIr$Tmp + две, которые ввел по ходу обсуждения: fIr$Tmp2 + fIr$Tmp3

function fIr$Tmp return number is
nRes number;
 begin        
    nRes :=  268435455;
    return nRes;
 end;
 
select SVC$23532PKG.fIR$Tmp as ver_0 from dual
-------
 VER_0
 429514

drop package SVC$23532PKG;   
create or replace package SVC$23532PKG as...
create or replace package body SVC$23532PKG as...
    
select SVC$23532PKG.fIR$Tmp as ver_0 from dual
-------
 VER_0
 429514

drop package SVC$23532PKG;   
--create or replace package SVC$23532PKG as...
--create or replace package body SVC$23532PKG as...
    
select SVC$23532PKG.fIR$Tmp as ver_0 from dual
???

drop package SVC$23532PKG;   
--create or replace package SVC$23532PKG as...
--create or replace package body SVC$23532PKG as...
    
select SVC$23532PKG.fIR$Tmp as ver_0 from dual
???

drop package SVC$23532PKG;

select SVC$23532PKG.fIr$Tmp from dual

ORA-00904: "SVC$23532PKG"."FIR$TMP": invalid identifier

set serveroutput on
declare
   c clob;
begin
   c := 'declare n number;begin'||chr(10);
   for i in 1..32768 loop
      c := c || ' n := ' || to_char(i+1000000) || ';' || chr(10);
   end loop;
   c := c || ' dbms_output.put_line(''n=''||n);' || chr(10);
   c := c || 'end;' || chr(10);
   dbms_output.put_line(substr(c, -53));
   execute immediate c;
end;
/

-- 32767/+1000000
 n := 1032767;
 dbms_output.put_line('n='||n);
end;

n=1032767

-- 32768/+1000000
 n := 1032768;
 dbms_output.put_line('n='||n);
end;

n=0

-- 32768/+0
 n := 32768;
 dbms_output.put_line('n='||n);
end;

n=32768

alter session set plsql_warnings = 'enable:all';

alter session set plsql_warnings = 'enable:all';
alter package SVC$23532PKG compile;

select  text, count(1) from dba_errors where name = 'SVC$23532PKG'  group by text
-----
PLW-06010: keyword "RESULT" used as a defined name	149
PLW-07203: parameter 'OP' may benefit from use of the NOCOPY compiler hint	1452
PLW-06002: Unreachable code	473
PLW-05018: unit SVC$23532PKG omitted optional AUTHID clause; default value DEFINER used	1

declare n number;
begin
 n := 1000001;
 n := 1000002;
...
 n := 1032766;
 n := 1032767;
 dbms_output.put_line('32770='||32770);
 dbms_output.put_line('32769='||32769);
 dbms_output.put_line('32768='||32768);
 dbms_output.put_line('32767='||32767);
 dbms_output.put_line('1000001='||1000001);
 dbms_output.put_line('1032767='||1032767);
end;
/

32770=0
32769=1000001
32768=1000002
32767=32767
1000001=1000003
1032767=1000004