How to get irb to run code as if it was typed in

it seems that we can

load “some_file.rb” or require “some_file.rb”

in irb to run the program. But after the run, i and a are both
undefined.
$g and foo on the other hand, are both defined. how can we make i and a
both defined, just like we typed it in irb?

i = 10
a = [1,2,3]
$g = 100

def foo(i)
puts i + 10000
end

p i
p a
p $g
p foo(i)

irb(main):001:0> load “test_irb.rb”
10
[1, 2, 3]
100
10010
nil
=> true

irb(main):002:0> $g
=> 100

irb(main):003:0> i
NameError: undefined local variable or method `i’ for main:Object
from (irb):3

irb(main):004:0> a
NameError: undefined local variable or method `a’ for main:Object
from (irb):4

irb(main):005:0> foo(123)
10123
=> nil

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