Initial taskSeq implementation with some modifications of the original source

src/.editorconfig

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+root = true
+
+###############################
+# Core EditorConfig Options   #
+###############################
+# All files
+# [*]                            # Do not apply to all files not to break something
+# Either crlf | lf, default is system-dependent (when not specified at all)
+# end_of_line=crlf
+# Remove whitespace at the end of any line
+
+# Code files
+[*.{cs,csx,fs,fsi,fsx}]
+trim_trailing_whitespace = true
+insert_final_newline     = true
+indent_style             = space # default=space
+indent_size              = 4     # default=4
+charset                  = utf-8
+
+# Project files and app specific XML files
+[*.{csproj,fsproj,shproj,projitems,props,targets,xaml}]
+trim_trailing_whitespace = true
+insert_final_newline     = true
+indent_style             = space
+indent_size              = 2
+charset                  = utf-8
+
+# XML configuration files
+[{nuget.config,packages.config,app*.config,web*.config}]
+trim_trailing_whitespace = true
+insert_final_newline     = true
+indent_style             = space
+indent_size              = 2
+charset                  = utf-8
+
+# XML files
+[*.xml]
+trim_trailing_whitespace = false # do not trim as it affects CData
+insert_final_newline     = true
+indent_style             = space
+indent_size              = 2
+
+# JSON and YAML files
+[*.{json,yml,yaml}]
+trim_trailing_whitespace = true
+insert_final_newline     = true
+indent_style             = space
+indent_size              = 2
+
+# Proto files
+[*.proto]
+trim_trailing_whitespace = true
+insert_final_newline     = true
+indent_style             = space
+indent_size              = 4
+
+###############################
+# F# Coding Conventions       #
+###############################
+# filetypes that need to be formatted by Fantomas:
+[*.{fs,fsx}]
+
+# files to be ignored for Fantomas may go into this file, if present:
+# .fantomasignore
+
+# indentation size, default=4
+indent_size=4
+
+# line length before it gets broken down into multiple lines
+# default 120
+max_line_length=120
+
+# Either crlf | lf, default is system-dependent (when not specified at all)
+# end_of_line=crlf
+
+# Whether end-of-file has a newline, default=true
+insert_final_newline=true
+
+# false: someLineOfCode
+# true: someLineOfCode;
+# default false
+fsharp_semicolon_at_end_of_line=false
+
+# false: f(1,2)
+# true: f(1, 2)
+# default true
+fsharp_space_before_parameter=true
+
+# false: Option.map(fun x -> x)
+# true: Option.map (fun x -> x)
+# default true
+fsharp_space_before_lowercase_invocation=true
+
+# false: x.ToString()
+# true: x.ToString ()
+# default false
+fsharp_space_before_uppercase_invocation=false
+
+# false: new Ship(withBeans)
+# true: new Ship (withBeans)
+# default false
+fsharp_space_before_class_constructor=false
+
+# false: __.member Foo(x) = x
+# true: __.member Foo (x) = x
+# default false
+fsharp_space_before_member=false
+
+# false: type Point = { x: int; y: int }
+# true: type Point = { x : int; y : int }
+# default false
+fsharp_space_before_colon=false
+
+# false: (a,b,c)
+# true: (a, b, c)
+# default true
+fsharp_space_after_comma=true
+
+# false: [a; b; 42]
+# true:  [a ; b ; 42]
+# default false
+fsharp_space_before_semicolon=false
+
+# false: [a;b;42]
+# true:  [a; b; 42]
+# default true
+fsharp_space_after_semicolon=true
+
+# false: no indent after `with` in a `try-with`
+# true:  must indent after `with` in a `try-with`
+# default false
+fsharp_indent_on_try_with=false
+
+# false: let a = [1;2;3]
+# true: let a = [ 1;2;3 ]
+# default true
+fsharp_space_around_delimiter=true
+
+# breaks an if-then-else in smaller parts if it is on one line
+# default 40
+fsharp_max_if_then_else_short_width=60
+
+# breaks an infix operator expression if it is on one line
+# infix: a + b + c
+# default 50
+fsharp_max_infix_operator_expression=60
+
+# breaks a single-line record declaration
+# i.e. if this gets too wide: { X = 10; Y = 12 }
+# default 40
+fsharp_max_record_width=80
+
+# breaks a record into one item per line if items exceed this number
+# i.e. if set to 1, this will be on three lines: { X = 10; Y = 12 }
+# requires fsharp_record_multiline_formatter=number_of_items to take effect
+# default 1
+fsharp_max_record_number_of_items=1
+
+# whether to use line-length (by counting chars) or items (by counting fields)
+# for the record settings above
+# either number_of_items or character_width
+# default character_width
+fsharp_record_multiline_formatter=character_width
+
+# breaks a single line array or list if it exceeds this size
+# default 40
+fsharp_max_array_or_list_width=100
+
+# breaks an array or list into one item per line if items exceeds this number
+# i.e. if set to 1, this will be shown on three lines [1; 2; 3]
+# requires fsharp_array_or_list_multiline_formatter=number_of_items to take effect
+# default 1
+fsharp_max_array_or_list_number_of_items=1
+
+# whether to use line-length (by counting chars) or items (by counting fields)
+# for the list and array settings above
+# either number_of_items or character_width
+# default character_width
+fsharp_array_or_list_multiline_formatter=character_width
+
+# maximum with of a value binding, does not include keyword "let"
+# default 80
+fsharp_max_value_binding_width=100
+
+# maximum width for function and member binding (rh-side)
+# default 40
+fsharp_max_function_binding_width=80
+
+# maximum width for expressions like X.DoY().GetZ(10).Help()
+# default 50
+fsharp_max_dot_get_expression_width=80
+
+# whether open/close brackets go on same colum
+# false: type Range =
+#            { From: float
+#              To: float }
+# true: type Range =
+#           {
+#               From: float
+#               To: float
+#           }
+# default false
+fsharp_multiline_block_brackets_on_same_column=true
+
+# whether a newline should be placed before members
+# false: type Range =
+#            { From: float }
+#            member this.Length = this.To - this.From
+# false: type Range =
+#            { From: float }
+#
+#            member this.Length = this.To - this.From
+# default false
+fsharp_newline_between_type_definition_and_members=true
+
+# deprecated setting, has no effect anymore
+# default false
+fsharp_keep_if_then_in_same_line=true
+
+# configures max width of Elmish expressions
+# default 40
+fsharp_max_elmish_width=40
+
+# Applies to Elmish expressions
+# default false
+fsharp_single_argument_web_mode=false
+
+# if a function sign exceeds max_line_length, then:
+# false: do not place the equal-sign on a single line
+# true: place the equal-sign on a single line
+# default false
+fsharp_align_function_signature_to_indentation=false
+
+# see docs: https://github.com/fsprojects/fantomas/blob/master/docs/Documentation.md#fsharp_alternative_long_member_definitions
+# default false
+fsharp_alternative_long_member_definitions=false
+
+# places closing paren in lambda on a newline in multiline lambdas
+# default false
+fsharp_multi_line_lambda_closing_newline=false
+
+# disables Elmish syntax parsing
+fsharp_disable_elmish_syntax=false
+
+# allows the 'else'-branch to be aligned at same level as 'else' if the ret type allows it
+# default false
+fsharp_keep_indent_in_branch=false
+
+# multiline, nested expressions must be surrounded by blank lines
+# default true
+fsharp_blank_lines_around_nested_multiline_expressions=true
+
+# whether a bar is placed before DU
+# false: type MyDU = Short of int
+# true: type MyDU = | Short of int
+# default false
+fsharp_bar_before_discriminated_union_declaration=false
+
+# whether to use stroustrup style for records, lists and CEs
+# To work reliably, fsharp_multiline_block_brackets_on_same_column must be "true"
+fsharp_experimental_stroustrup_style=true
+
+# from docs: Please do not use this setting for formatting hand written code!
+# default false
+fsharp_strict_mode=false

src/FSharpy.TaskSeq.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32811.315
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "FSharpy.TaskSeq", "FSharpy.TaskSeq\FSharpy.TaskSeq.fsproj", "{9A723760-A7AB-4C8D-9A6E-F0A38341827C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9A723760-A7AB-4C8D-9A6E-F0A38341827C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9A723760-A7AB-4C8D-9A6E-F0A38341827C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9A723760-A7AB-4C8D-9A6E-F0A38341827C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9A723760-A7AB-4C8D-9A6E-F0A38341827C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {2AE57787-A847-4460-A627-1EB1D224FBC3}
+	EndGlobalSection
+EndGlobal

src/FSharpy.TaskSeq/FSharpy.TaskSeq.fsproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="TaskSeqBuilder.fs" />
+  </ItemGroup>
+
+</Project>