Redundant Optional Initialization in multi-var declaration results in transposed space and ',' char

[rlpm]

I encountered the following while linting a much larger file. But I boiled it down to a single line. SwiftLint transposes the space and ',' characters after fixing a Redundant Optional Initialization:

% cat > foo.swift <<< "var a: Int? = nil, b: Int"
% cat foo.swift
var a: Int? = nil, b: Int
% swiftlint --fix foo.swift                      
Correcting Swift files at paths foo.swift
Correcting 'foo.swift' (1/1)
/tmp/foo.swift:1:12 Corrected Redundant Optional Initialization
Done correcting 1 file!
% cat foo.swift            
var a: Int? ,b: Int
% swiftlint --fix foo.swift
Correcting Swift files at paths foo.swift
Correcting 'foo.swift' (1/1)
/tmp/foo.swift:1:12 Corrected Comma Spacing
Done correcting 1 file!
% cat foo.swift            
var a: Int?, b: Int