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limitations.md: update version references and add missing limitations

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Update CRuby/mruby version labels to generic names. Add sections for
refinements, Encoding, integer precision by boxing mode, and
ObjectSpace limitations.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-02-27 18:35:47 +09:00
parent 0a5a305a01
commit 366d9be721
1 changed files with 45 additions and 19 deletions
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doc/limitations.md
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@@ -28,11 +28,11 @@ rescue
end
```
#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
#### CRuby
`ZeroDivisionError` is raised.
#### mruby [3.1.0 (2022-05-12)]
#### mruby
`RuntimeError` is raised instead of `ZeroDivisionError`. To re-raise the exception, you have to do:
@@ -64,11 +64,11 @@ end
p Liste.new "foobar"
```
#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
#### CRuby
`[]`
#### mruby [3.1.0 (2022-05-12)]
#### mruby
`ArgumentError` is raised.
@@ -82,13 +82,13 @@ other reflection methods instead.
defined?(Foo)
```
#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
#### CRuby
```
nil
```
#### mruby [3.1.0 (2022-05-12)]
#### mruby
`NameError` is raised.
@@ -101,11 +101,11 @@ of the ISO standard.
alias $a $__a__
```
#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
#### CRuby
`nil`
#### mruby [3.1.0 (2022-05-12)]
#### mruby
Syntax error
@@ -122,26 +122,21 @@ end
'a' + 'b'
```
#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
#### CRuby
`ArgumentError` is raised.
The re-defined `+` operator does not accept any arguments.
#### mruby [3.1.0 (2022-05-12)]
#### mruby
`'ab'`
Behavior of the operator wasn't changed.
## `Kernel#binding` is not supported until [3.0.0 (2021-03-05)]
## `Kernel#binding` is not supported without mruby-binding gem
`Kernel#binding` method is not supported.
#### Ruby [ruby 2.5.1p57 (2018-03-29 revision 63029)]
```shell
$ ruby -e 'puts Proc.new {}.binding'
#<Binding:0x00000e9deabb9950>
```
`Kernel#binding` method requires the `mruby-binding` gem (included
in the `metaprog` gembox). Without this gem, `binding` is not
available.
## `nil?` redefinition in conditional expressions
@@ -263,3 +258,34 @@ The following are **not supported**:
- Boolean pattern check: `value in pattern`
Note: mruby does provide `Array#deconstruct` and `Hash#deconstruct_keys` methods for future pattern matching compatibility.
## No Refinements
Module refinements (`refine`, `using`) are not supported in mruby.
## No `Encoding` Class
mruby does not have an `Encoding` class. Strings are treated as
byte sequences by default. UTF-8 aware string operations can be
enabled with the `MRB_UTF8_STRING` compile flag.
## Integer Precision Varies by Boxing Mode
Integer size depends on the value boxing configuration:
| Configuration | Integer range |
| ------------- | ------------- |
| Word boxing, 64-bit (default) | roughly +/- 2^62 |
| Word boxing, 32-bit (default) | roughly +/- 2^30 |
| NaN boxing (64-bit only) | -2^31 to 2^31-1 |
Code relying on 64-bit integer precision may behave differently
across configurations. The `mruby-bigint` gem provides
arbitrary-precision integers when included.
## No `ObjectSpace.each_object` by Default
`ObjectSpace` is only available via the `mruby-objectspace` gem
(included in the `stdlib` gembox). Even with the gem,
`ObjectSpace.each_object` has limited functionality compared
to CRuby.