On systems where the Encoding.default_internal defaults to US-ASCII instead of UTF-8, some tests using assert_raise_with_message can fail since it no longer changes Encoding.default_internal in 79f5202. This tests explicitly uses EnvUtil.with_default_internal on systems where these tests fail.
`Integer.sqrt` uses `sqrt(3)` from libm for small values. This method must return a value less than or equal to the actual integer square root, but libm's sqrt does not always guarantee that. This change corrects that by decrementing the result if necessary. Fixes [Bug #21217]
... for slow CI machines like macOS.
... instead, just calculate the value unless it is too big. Also, this change raises an ArgumentError if it is expected to exceed 16 GB in a 64-bit environment. (It is possible to calculate it straightforward, but it would likely be out-of-memory, so I didn't think it would make sense.) [Feature #20811]
The tests for Integer#ceil was accidentally placed in test_truncate.
[Bug #20654]
This commit fixes Integer#ceil and Float#ceil when the number is
negative and ndigits is large such that 10**ndigits is a bignum.
Previously, it would return 0 in such cases. However, this would cause
unexpected behaviour such as:
puts 1.ceil(-5) # => 100000
puts 1.ceil(-10) # => 10000000000
puts 1.ceil(-20) # => 0
This commit changes the last result so that it will return
100000000000000000000.
[Bug #20654]
This commit fixes Integer#floor and Float#floor when the number is
negative and ndigits is large such that 10**ndigits is a bignum.
Previously, it would return 0 in such cases. However, this would cause
unexpected behaviour such as:
puts -1.floor(-5) # => -100000
puts -1.floor(-10) # => -10000000000
puts -1.floor(-20) # => 0
This commit changes the last result so that it will return
-100000000000000000000.
As the document states, it should return `self`, not `nil`. Fix up of f4b313f7338f5fbe37f73aae29f70aeb474f7f5b.
When dividing near the precision limit of `double`, use Bignum division to get rid of rounding errors.