TOML 1.1 is now enabled by default. The TOML changelog has an overview of changes: https://github.com/toml-lang/toml/blob/main/CHANGELOG.md

Also two small fixes:

• Encode large floats as exponent syntax so that round-tripping things like 5e+22 is correct.

• Using duplicate array keys would not give an error:

  arr = [1]
  arr = [2]
  

  This will now correctly give a "Key 'arr' has already been defined" error.

Mostly some small bugfixes, with a few small new features:

• Add Position.Col, to mark the column an error occurred (#410)

• Print more detailed errors in the tomlv CLI.

• Ensure ParseError.Message is always set (#411)

• Allow custom string types as map keys (#414)

• Mark meta keys as decoded when using Unmarshaler interface (#426)

• Fix encoding when nested inline table ends with map (#438)

• Fix encoding of several layers of embedded structs (#430)

• Fix ErrorWithPosition panic when there is no newline in the TOML document (#433)

This version requires Go 1.18

• Add toml.Marshal() (#405)

• Require 2-digit hour (#320)

• Wrap UnmarshalTOML() and UnmarshalText() return values in ParseError for position information (#398)

• Fix inline tables with dotted keys inside inline arrays (e.g. k=[{a.b=1}]) (#400)

Fix reading BURNTSUSHI_TOML_110 again 😅 The fix for 1.3.1 caused a race issue with multiple decodes being run in parallel.

This fixes two small bugs:

• The BURNTSUSHI_TOML_110 environment variable would be checked on package import, rather than Decode().

  This meant that setting os.Setenv("BURNTSUSHI_TOML_110", "") had no effect, as it happens after the import.

• Fix order of Meta.Keys() for inline tables (this has been an issue since support for inline tables was added).

New features:

• Support upcoming TOML 1.1

  While it looks like TOML 1.1 is mostly stable and I don't expect any further major changes, there are NO compatibility guarantees as it is NOT yet released and anything can still change.

  To use it, set the BURNTSUSHI_TOML_110 environment variable to any value, which can be done either with os.SetEnv() or by the user running a program.

  A full list is changes is available in the TOML ChangeLog; the two most notable ones are that newlines and trailing commas are now allowed in inline tables, and Unicode in bare keys can now be used – this is now a valid document:

  lëttërs = {
    ä = "a with diaeresis",
    è = "e with accent grave",
  }
  

• Allow MarshalTOML and MarshalText to be used on the document type itself, instead of only fields (#383).

Bufixes:

• \ escapes at the end of line weren't processed correctly in multiline strings (#372).

• Read over UTF-8 BOM (#381).

• omitempty struct tag did not work for pointer values (#371).

• Fix encoding anonymous structs on 32bit systems (#374).