修正数据类型转换相关的一些描述

.gitignore

@@ -0,0 +1,89 @@
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# =========================
+# Operating System Files
+# =========================
+
+
+# OSX
+# =========================
+
+.DS_Store
+*/.DS_Store
+.AppleDouble
+.LSOverride
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+*.class
+logs/*
+*/logs/*
+**/logs/*
+
+*.o
+
+# xcode
+*.xcodeproj*
+
+# idea
+.idea*
+.idea/*
+*/.idea*
+*.iml
+*/*.iml
+
+# sbt specific
+.cache/
+.history/
+.lib/
+dist/*
+target/*
+out/*
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+.sbtserver/
+classes/*
+
+# Scala-IDE specific
+.scala_dependencies
+.worksheet
+.*.swp
+
+# sbt-assembly
+*-assembly.jar
+sg_agent/