Can't parse Float64 starting with zero on YAML files?

[ghost]

Crystal version:

Crystal 0.24.1 (2017-12-26) LLVM: 5.0.1 Default target: x86_64-apple-macosx

This works:

require "yaml"

class Config
  YAML.mapping(x: Int32, y: Float64)
end

str = <<-YAML
dev:
  x: 12464  
  y: 3.5
YAML
 
dev = Hash(String, Config).from_yaml(str)["dev"]
dev.y  # => 3.5

This doesn't:

require "yaml"

class Config
  YAML.mapping(x: Int32, y: Float64)
end

str = <<-YAML
dev:
  x: 12464  
  y: 0.5
YAML
 
dev = Hash(String, Config).from_yaml(str)["dev"] 
#=> Expected Float64, not 0.5 at line 3, column 6

I'm using scientific notation (5e-2) as a workaround at the moment, which also works.

[straight-shoota]

Seems like the yaml core parser treats any plain value starting with a zero as an octal integer.

[ghost]

Yeah... .5 also doesn't work

[straight-shoota]

But that's according to the spec http://yaml.org/type/float.html

[straight-shoota]

I have a patch for this issue but discovered some other issues with parsing YAML floats in the process :/